motherboard lights on but no fans

© Since 2000 Neowin LLC. (I'm building a PVR). I'm using a heat pipe that clips on, so that will be kind of hard to get off (I feel like I'm going to break the clips or worse whenever I go to remove it). Hope not). Nothing connected power or signal but power supply to mobo, CPU/HSF plugged in, One stick of memory. a brief tutorial about the components of a personal computer and where the motherboard fits into the scheme I thought I should include this because I've been thinking that this may be the last thing, other than the PSU itself, that I could see wrong since I've read that computers can be finicky in what it needs to find to turn itself on (I've plugged, unplugged, and replugged everything else in a variety of ways).Any quick help could be appreciated. It will be near to CPU. Look at every capacitor on the motherboard and check that they haven't burst. If it still doesn't work, just remove any PCI devices except for the videocard (unless it's an on-board videocard, in which case you just remove all PCI devices). It is a well known issue. RGB lights on the motherboard are working but wont turn on. Whenever I press the power button the fans all spin, four lights turn on and stay lit on the motherboard but the PC doesn't actually start. If it turns out not to be a graphics card problem, or memory. Also tried a couple of other things... pulling out the CMOS battery for a few minutes to reset it, and trying to start it without any RAM just to see if the mobo would give me the "Hey, gimme some RAM stupid!" I've seen dead mainbards from Dell (laptops and desktops) more than i should have seen..honestly i can say that those were old models (circa 2008 till 2010), because newer models don't suffer from completely engineering stupidity like this board from a GX620: (in case you are wondering what's wrong, let me tell you that all those capacitors near the CPU are in the most hottest area of the board and not dumb enough the case of this wonderfully crap desktop has only one fan... that pushes air into the CPU and directly to the HDD, without any way to vent it. They aren't the most tech savy, and are afraid of breaking something, so I'll test the other suggestions at a later date. The capacitors don't have to be blown all to bits either. Just completed a new PC build last night. I assume the mobo is working right because the LED light is turning on (hopefully that's a good sign), but the case came with its own power supply with a bunch of M/F connectors that I had plugged in, but I have done everything, I think several times, to no avail.It may not be important, but on the side panel of this case, there is a side fan that should connect to a M/F connector (I think) on the PSU. Using known working replacements, I've also ruled out the video card, RAM, and any of the optical devices. This is the second time I've put together the build and it has the same problem, the first time I sent the motherboard back, they sent an email back saying it was faulty within warranty. Additional steps you can take to try to locate the faulty component. I tried to power it … I have been running an Antec true power 2.0 for several years on an Asus P4C800 mainboard. The motherboard indicates with an LED light usually if it gets power. Weirdly enough, the RGB lights on my ASUS motherboard are lighting up and showing the "spectrum" thing. However, the monitor says “VGA NO INPUT” and the DRAM light on my motherboard is on. I am having issues with my motherboard LEDs not turning off when the board system is Shut Down. Best Cyber Monday deals still available: AirPods, Amazon Echo, laptops and more, PS5 restock update: Check inventory at GameStop, Best Buy, Walmart, Amazon and Target, Xbox Series X restock update: Check inventory at Amazon, Best Buy, Target, Walmart and more,, No bios. If the mobo power supply turn on logic is working, when you hit the power switch its logic turns the remaining power supply rails on [5 volt main, 3.3 volt, 12 volt] Side comment, do you have the 4 pin 12 v connector plugged in [this is not necessary for the supply to turn on but is necessary for the CPU to work]? Fans don't even attempt to spin, no LED Lights, no Beeps, its like the PC is completely unplugged. © 2020 CNET, A RED VENTURES COMPANY. Had to threaten Dell that we were moving to HP to get them to 'admit' there was an issue, and they fixed all 150+ units. Strip it to a bare minimum and see if it will boot. I even purchased new RAM & a power supply. Any fans spinning? Detach any DVD / CD drive and HDD. And I can't help her with that, since she is visiting with her dad out of town. She also checked all the cables and everything. She isn't comfortable unplugging everything, but guess she will have to lol. Please help! It's not to often that the capacitors just make the computer basically go poof, but very possible, especially on a Dell. Motherboard on but not booting I have plugged in everything and then turned on my computer according to the instructions for first time boot up. If it isn't POSTing (No beeps) and there is no sound coming from Windows indicating a good boot (Windows startup chime), then it wouldn't be a video sync issue. It worked. The issue: Turn it on and everything seems to get power, fans run up, LED’s on the motherboard, graphics card and CPU cooler light up, monitor and keyboard both get power. I want to be sure it's a mobo issue before I replace it, but I'm thrown off by the LED indicators. The pins that have voltage fom the Power Supply on them are always female, so that you won't accidently short the hot leads to ground.The fan will then run at consnt maximum speed from the 12 volts from the supply. The fans actually go crazy, spinning at full force. The pictures of the case in the link I gave should provide good indication of the type of connectors it is, one female, one male, and right now, I have them in such a way that if you take out those green cables, the other cables connect to themseves and not the PSU). If yes let us know. As of December 1, 2020, the forums are in read-only format. ; C RGB PC Lighting Sync: click the big chain icon in the upper right corner, you may sync RGB LED light effect to all product. Maybe simply a bad supply. No fans, no lights, no beeps, no clicks - nothing. No lights, No fans just a flash on the mobo led's, the Clear CMOS and Power on the rear panel and the RGB lights on the memory is lit. I have no clue what else it can be. Too late in the day for me.If only the power supply fan comes on . It turned out that the mainboard was the root of the problem with a bad controller on it. See if that does anything. So far nothing, but from the sounds of it, can be a very small brown speck, which makes it difficult to find.. Poor Dell onsite tech, horrible job! However when the system goes into shutdown the headers turn off but the motherboard LEDs go into rainbow cycle mode. Good luck. (when you press the start button).....and you have your case fans plugged into the 12volt rail(wiring harness) on the power supply....then the power supply is getting a start logic signal from the main the power supply is the likly problem, not the mainboard. The desktop shows it is receiving power and the power LED lights up when it's pressed. And no, didn't try just 1 ram module, but I'll have her try that as soon as she can. There's no on-board speaker so I don't know if anything's beeping. No fans spinning up, no pump pumping, no POST, nothing. For a little clarity, this is my cooling mech:, when I said hope not, I meant that I hope my mobo wasn't fried, not that I hope that it WAS. After a quick restart it wont boot anymore. 1 to 10 are still the same and what was 11 t0 20 are now 13 to 22. CMOS did nothing, and no beeps from the mobo when no RAM was installed. Appreciate anyone's help. I had this happen to over 150 Dell Optiplex GX520 units. If it's not connected or providing the right power, will cause the CPU to fail. Yes, she did try that too, just forgot to mention that in the first post. The Green wire that is either pin 14 [in 20 pin] or pin 16 [for 24 pin] is the pin that the logic ciruit puts a logic low on to turn on the main rails.Take a brand new supply out of the box plug it into AC power with the rear switch on and simply jumper the green wire to any of the black wires on the same cable and the supply will turn on as evidenced by its fan running. I assumed it was the PSU, went out got a new one, put it in, same result. As long as that contact is maintained the supply will stay on. Any suggestions on what and how to troubleshoot? It wasn't a recoverable thing on our end and we ended up getting factory mainboard replacements. I know is a very simple step and dunno if you already tried (I didn't read it in the thread). Remove the power cable (or anything that provides any type of power). Another thing to check, especially with Dells, is for bad capacitors. Not that this would be the same for your computer, but at my job, we had a bad run of HP's that would do the same thing with their fans. Neither are used any more so some mfrs don't bother putting a Minus 12 volt rail in to save money.My Antecs came ith a little manual that gave all the wiring info. You can tr… Alright, I took everything out, all of the cables, the cpu, the motherboard, and fans. Press and hold the power button for around 15 seconds. There is no onboard video....I had been hoping there would be, but there isn't, and no extra video cards laying around at the moment...I'll see if he has something to test the power supply with, a multimeter or something. yeah....), They will be picking up a multimeter to check it out (Always nice to have one around anyways lol,, That is some bad planning on Dells part then lol Thanks for that info, I'll have her look at the capacitors near the CPU extra carefully :). Under the Light Effect column, click off. My thought is the power supply is screwing up, but they don't have an extra one to test it with. This tells you which pins are the "start" button. location when coming from one end of the connector. In early 2021, CNET Forums will no longer be available. Was running C4D with Redshift IPR not activated, Substance Painter and Chrome with a bunch of tabs. I tried the fan test, the PS is fine. Black screen. The monitor light remains orange and doesn't go green. We jokingly call it the self clean mode as it pushes dust out fast. I don't know if that is something that should be considered or not (there are two green cables that come out of the front of the case that I've been hooking it up to. Hi everyone, Computer powers on, fans run, no video or post or beeps. Do you hear fans starting to work inside the PC? If you are really needing your computer, you should take it to a repair shop, where they can test each componet, and you only pay for the one you need.Sorry if I confused you the first time. I also had her remove the BOIS battery for 1 minute, and replace it. I removed all peripherals, USB and fan connectors, RAM and hard drives and still not turning on. ncc50446, Run the PC barebones (disconnect all peripherals except the monitor). And you should NOT need any third-party RGB controller. She has tried some of the suggestions here, but doesn't want to break things further. for it is not uncommon for a graphics chip to fail. Similar to darkprwjd, my desktop is doing the same thing, the only difference is how we got there. I have a gigabyte aorus pro wifi board with amd ryzen 3700x. After firing up all fans and lights work except for GPU fans. As a side note describe exactly what the side fans connector looks like. Japan's asteroid return mission arrives on Earth, YouTube will ask users to rethink before posting potentially offensive comments, Cyberpunk 2077's exact launch and pre-load times detailed, PC won't boot - No video, no beep, but fans spin,, The desktop still does not boot. If it beeps every few seconds, my guess would be a RAM issue. Thinking it was the PSU I picked up a new one but that didn't fix it. [they replaced it] The Power Good line should change state about 100 to 500 milliseconds after the supply mains start. I have set the motherboard LEDs and RGB LED headers to static red in Aura and when the system is powered up everything is working correctly. I have lots of expierence in building up computers, but I had the same problem as you. After that, the experience I had is similar to what was earlier discussed... the mobo's LED light beside the 24-pin main power connector is illuminated, the LED indicators for the LAN connection are illuminated, and - most frustrating of all - when I press the power button, the front-of-the-case power LED comes on, but nothing else happens. Hey there. I have not "seen it all, done it all"...but I have worked in electronics all my life....and on some occasions, things get tricky. The outlet works just fine. They always had a Minus 5 volt wire and a Minus 12 volt wire. If you know someone who has an old video card laying around , that is easy to eliminate.If only the power supply fan comes on.....I would suspect the main board is dead. THe processor WAS fine 2 hours ago, it was in my desktop. Suddenly my computer turned off, as if some fiendish leprechaun pulled the plug right out of the power bar (I checked - no leprechaun). I've seen as well damaged boards that shared a similar situation, but those boards had a all common factor: faulty capacitors. All that the mobo power control circuit does is tie the green wire to a logic low when you hit the power on switch.I had a 450 Antec where all the power turned on but the sytem would not boot. If you don't see any light there, it can mean that cables are not connected properly anymore, or that the power supply or motherboard are dead. Thanks for that information :) I'm hoping that it's only the power, Thanks for that information as well, guess I'll tell her to grab a magnifying glass lol. I've got the POST test card now and some of the lights stay lit on it but it doesn't seem to show any codes just four lines in the led display where the codes are meant to be. I recently order an Antec true power 3 650 watt to upgrade. Is the PC using a on-board graphics card or a PCIe card? No other lights either. The first 20 wires are unchanged physically. Does the processor heat sink fan come on, and the case they also come on ? Just a tiny, tiny brownish spot on the tops of them and they're toast. Troubleshooting. Now the first thing you’ll need to make sure about your monitor is, that it’s ‘Powered ON’ and the video cable is connected properly.Most of the times just because of some loose cable, a lot of people having this black blank display related problem. I assumed it was the PSU, went out got a new one, put it in, same result. She shut it down, and tried to reboot. I tried replacing RAMs from other units as well, but that did not solve the problem. The lights would come on, the fans would spin (case fan, cpu fan, power supply fan, video card fan). Figuring a flaky power supply, I bought and installed another one. Here is a list of what i tried : HP M8300F I disconnected everything, cleaned … 1. Screen does not power up but fan and hard drive spinning. Sorry. By Now the fan starts, the red led on the mobo lights and I hear a couple of faint clicks as if something wants, or has tried, to start (one immediately with power on and a second a couple of seconds later. What I do not notice in your post, OP, is the RGB Fusion software. I had her remove all the ram, and try to start the computer. If the fans still dont spin it could be just a faulty fan controller in the front I/O - you can get a replacement for that by contacting rosewill, or alternatively switching it out for another case or switching out the fans for other fans and see if that fixes the issue. I would power it on but only fans would work, on-board LAN worked too (i think, because its LEDs are flashing), but no power for the keyboard and mouse. All trademarks mentioned are the property of their respective owners. The computer was dusted out, though it was already pretty clean to begin with. System would be fine, next power up randomly, it would not POST or do anything else, but the fans would go into a high speed mode making the tower sound like a wind tunnel. Here's my specs: AMD Ryzen 7 1700; ASUS Prime X370-Pro; Gainward GTX 1080 GLH; 2x8GB Corsair Vengeance LPX DDR4-3000; Corsair RM1000x PSU + BitFenix Alchemy 2.0 cables. I am not saying it is the case with your board, but if the fans are doing the full speed action upon cold boot with no post, this is a pretty good indicator of something deeper than a few loose cables. It was displaying the debugger light for the CPU. Was hoping that no one took it the latter way. If it does, from there on just start plugging devices back in. A friend told me that it might be CPU that prevents it from booting, primarily because of insufficient cooling, so I went on buying a new CPU fan (Deep Cool Gamma Archer), and then installed it. So until I can take a look at the computer personally, and do what others have suggested, she is stuck using a pc that isn't quite as good lol Could be a couple months before I get to take a look at it..Unless she can bring it to me sometime lol. I'd go for the minimalistic route. Unplug every external device, except for the keyboard, monitor and power. The 20 pin was numbered from 1 to 10 along one side and 11 to 20 along the other side. Was actually a problem that I had with one of my computers a month ago lol But had no effect for her.. Nothing else, no drives no video card, no keyboard or mouse.Between each step turn power off COMPLETLEY, no LEDon.Hit the power button, does the power supply come up as noted by the supply's fan and CPU's HSF coming on and STAYS ON. 3, Bios could be corrupted or possibly blown. The fans actually go crazy, spinning at full force. There is no beep however, and no video. As others have indicated, likely a graphics card issue, especially if it's an nvidia chip as indicated in the wiki. Maybe a faulty RAM module? Turns On But No Display - Led Light On Fan Spinning - CPU Stupid Mistake Easy Fix Help my laptop's screen isnt showing any display but lights are on and fan is spinning: Laptop not loading, fan spins, hard drive spins,stops and repeats without sending signal to the screen: Laptop black screen fan spin at full speed non-stop: Laptop turns on. I was troubled, because the spec sheet said the PS was backward compatable. No fans, no lights, no beeps, no clicks - nothing. I've seen a similar case like you're having and it was the PSU that went bye bye; the fact that it still powers the board doesn't mean it's powering all the components or it's powering with a constant flux; if you can test the PSU with a multimeter or even quicker test with another PSU. The light effect is still adjustable as previous step. I'm hoping it's not a motherboard problem...Power supplies are cheaper than motherboards lol. Fans are running. This gives the voltages time to charge the capacitors and get into spec before the power good line releases the Master Reset line to allow the boot process to begin.Thus, I have no idea what you ran into unless it was related to the 6 pin connector which years ago were wired differently than the new 6 pin ones used for video cards. The problem was that the Power Good signal never changed [pin 8 in both cases]. Then I put the CPU back in, put the cable for power for the motherboard into the PSU, then put the CPU power cable into the PSU, and plugged that into MB, and then I turned it on. I had a similar issue a long while back that was the results of Video sync issues with the monitor syncing with my video card. I replaced the motherboard but the problem still presists. The case comes with a 3-from-1 RGB Splitter cable so you can connect all three fans' RGB cables to a single mobo plain RGB header, and supply those lights with all the power and control they need. I've seen an issue similar to this a few years ago, where because the CMOS battery was flat the computer would only spin up the fans. Don't know what kind of cheap, leaky crap they use, but that's a pretty common problem in them. Just trying to help. like the HDD LED lights and all that (wanted to go for the basics), and even switched orientation on the PWR cord, but it won't turn on still (I'm thinking that something became unplugged on the other end on this cord, because I heard a snap last night when trying to get this to go when I pressed the power button). Feel like I'm gonna have to, though.But yeah, it is still not starting up (LED light is still turning on, though. Nothing which could defeat or overheat the system. This just gets better and better!,, Car Parts, Gadgets, & How-to's - Roadshow. Thanks, I'll have her keep looking. Try changing resolutions on your monitor and maybe demagnitize. I will post again , when I try to install the new one. But … Reconnect the cables and see what happens. After digging around on Antec web site, I found a link to a PDF file that gave industry standards for ATX power supplies, including the pin out for all connectors to the main board. Quick sum up of my system - running WinXP on Intel Pentium D 840 3.2 ghz processor / Intel D945GPMLKR Socket 775 mobo / 2 GB PC4200 DDR2 RAM / ATI Radeon X700 video with 256 MB GDDR2 RAM / and then the usual optical connections + a TV tuner card. a standard four pin Molex connector. completely dead. God I hope I didn't blow the PSU when that happened. This will add the fan into the top left-hand corner, next, we click on the light bulb icon of the added fan. ALL ATX power supplies SHOULD work on ALL ATX mainboards.....but....not a perfect just aint so. I had plugged everything in several times, trying different orientations and what not, making sure everything is in right, but nothing will turn on except the mobo LED light on the board. For ASRock Motherboards. It's still giving me the little red light and continuously resetting. That's when the trouble began.. Also remove all RAM modules except for 1. GIGABYTE GA-78LMT-S2PT rev 4.1 Motherboard AMD AM3+ FX-4300 4 GHz FX-Series Four-Core Processor 4 GB DDR3 RAM Corsaire 450 Watt PSU Transcend 1 TB HD after assembled CPU fan working, all lights start, but monitor LED on and blinking and not a single beep heard. the entire system before checking anything to see if the basic functions worked.Now you get back to do that.The LED on the mobo simply tells you that there is the 5 volt standby voltage on the mobo.

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