this action keeps repeating. ... voltage gets below 2.6V then there is a chance that the settings can become corrupted which can prevent a normal start … when the power was switched on, the fans(cpu and psu) spin and then stop. I changed the fan over but I still have the same problem. You can use the PSU, case/chassis or GPU fan header. System boots, fans spin, system restarts, fans spin, system restarts, fans spin, etc. Other combinations fail. I powered off. If you're new to the TechRepublic Forums, please read our TechRepublic Forums FAQ. Below are the relevant specs: © 2021 ZDNET, A RED VENTURES COMPANY. A good set of fans can keep your computer from overheating, but they can also make your computer sound like a wind tunnel. This one has lasted for some time now, (money well spent). When I go to hit power, the fans spin a second and then stop. Computer fans can get pretty noisy, but there are a few things you can do to reduce the din. I have returned the CPU and the Motherboard, both are new. Or were some standoffs shorting the power supply?? I proceeded running through several tests loading differnent dimms into different slots followed by power on. I pushed on the Ram sticks and still wont work.. that same computer guy now said it was the PSU gone so he connected up a new PSU and the exact same problem happened.. so he said my motherboard is screwed and to buy a new PC from him. Powered the system on. BUt once it hanged . Reboot as needed to test. Power on issue: system and cpu fans start briefly then stop.... Power on issue: system and cpu fans start briefly then stop. - edited The previous post garnered expert advice, so I am hoping someone will have some idea on what I can do. Same fan issue persisted. A recent Windows 10 update restarted my system. Then after at most 3 seconds, the power supply shuts down (both fans stop). Simply ask a new question if you would like to start the discussion again. I thought I have ruled out everything, so I am a little lost. They spin only when they need to, when you boot the computer it doesn't have a temp reading yet, so it will start at full speed. Powered on confirmed that the PSU fan was working ok. Notice the CPU fan spins for half a second and stops. Pros couldn’t find anything wrong. etc. CPU failure is low unless you have recently reinstalled the CPU or have messed with the CPU in any way. I dont know what to do. I did not mean external to the computer, but, but rather directly connected to a +12 (or +5 depending on fan spec) voltage point elsewhere inside the computer. Boot error showed "ERROR: System Fan Has Failed.Service PC to prevent damage to the system.Press to continue". - edited I've built PCs in the past and stuff but I don't really want to open it up unless this is pretty much guaranteed to work as I do not want to void the cover on it for him but he has assignments due in very soon and needs access to itUPDATE: We opened it up and the 4 pin power connector was connected. Same sypmtoms. The power supply fan starts and the CPU cooling fan starts. All submitted content is subject to our Terms Of Use. I updated the bios and as soon as the bios program began updating the bios, the fan kicked in at full speed until the bios was finished updating and then switched off again. The memory was also removed and each piece was tried in each slot. ‎07-13-2018 NOTE: the PS LED light is solid green. ‎07-13-2018 I dusted out the original PSU and re-installed it. Help Whenever I start up my laptop I checked the bottom of my computer and both of the fans spin at a decent speed for about 2 seconds and then they both stop spinning, the other fan will spin at other times but the GPU fan never spins, and whenever I launch a game my laptop overheats whenever I play for 5 minutes. What would happen was a rev up on the fan so it was really loud, and the monitor wouldn’t come on and I’d have to restart the computer. Powered the system on. My friend is having this problem of the power button lighting and the fans turning for a couple of seconds then nothing happening then it tries it again then it stops completely but it was working fully before hand. I scrounged up a good PSU from someone and it did the same thing. Stay tuned! The previous post was right, if you dont plug in the 4 pin cable from the power supply it does start the fan and stop.These 4 pin come with some Antec power supplies. But that's assuming some wayward setting is causing the fan to stop … After this I did a bit of fiddling with the power button jumper. Thanks. Microphone Only Picking Up Output Sounds (Desktop Audio). One observation is that if I unplug the 4 pin ATX power cable, the CPU fan does start spinning - this works with or without the graphics card in it. Fans start then stop. It seemed to work fine. It's working great except for the fan is constantly rev'ing up and down, but I'm not doing any intensive tasks. Tried turning the computer on again, by using screw driver to short the power switch pins. ‎07-01-2018 Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. RMA'd the … Disconnect all SATA devices. The only thing that has worked is after booting, is to log into windows then shut it down through the start menu. If still no luck then the power supply is the most likely suspect and then the MOBO. This time the fans ran at top speed! Let me try out your suggestions. Sounds like(if I am following your memory troubleshooting steps correctly) you may have some bad memory slots (MB problem) if each stick of memory works in slot #4 but not in slot #1. Please note: Do not post advertisements, offensive material, profanity, or personal attacks. The only issues (until now) have been spinning disk replacements. You could try replacing the CR2032 motherboard battery. CPU= AMD 3700+ (ada3700bnbox) mobo= Asrock 939s56-m When switched on the fans all spin … Your PC may trouble you when it does not start up correctly the fan spins for a few seconds and stops. If you're asking for technical help, please be sure to include all your system info, including operating system, model number, and any other specifics related to the problem. Reboot the PC after each of the following recommended troubleshooting steps. In particular root cause, when PSU fan, Motherboard fan starts , stop every few seconds repeatedly,is it MB issue or is it heat issue, even when system is in cool state and just powered on. Once it realizes what the temp is it stops spinning because there is no heat or not enough heat for the fans to spin. (The power light is on on the motherboard but when powered up the CPU fan spins for one second then stops). Typically you don't want a CPU to go over 70 degrees, so make sure that your fan runs fast once it gets that hot, and preferably starts to … Try each memory module in each memory slot. Fans only spin at startup for like 2 seconds and then stop spinning. It did for me. etc. If it spins, then the problem is with your fan. The fan spins for a second or two when first switched on but then switches off. Here is what is happening.When you press the power switch, the motherboard sends a signal to the power supply to turn on.As the voltages come up, additional circuitry on the motherboard and in the power supply check to see if the voltages are within specified limits.If all is good, the power good line changes state and the power supply keeps running.You have the power starting up, but no power good signal.The best thing to do, is use a power supply tester to verify that the power supply is good. the fans will spin for a second then stop. Thanks for your help, but it has been a long two months and I am still stuck. 08:01 PM. Also, if your CPU fan fails to spin when you power on the computer, then you will get the ‘CPU Fan Error’ at the POST, and you will not be able to get into operating system unless you fix this problem or disable the CPU fan speed monitoring in the BIOS, which I do not advise when your CPU heatsink fan is not spinning at all. 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