Now remove all RAM modules. I took out the power supply and tried it on another motherboard (without any other loads). Notice the CPU fan spins for half a second and stops. 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. This time the fans ran at top speed! ALL RIGHTS RESERVED. Time to upgrade to some newer technology. If more than one fan, perhaps where the other gets power. 07-01-2018 System boots, fans spin, system restarts, fans spin, system restarts, fans spin, etc. Microphone Only Picking Up Output Sounds (Desktop Audio). Powered on confirmed that the PSU fan was working ok. Computer fans can get pretty noisy, but there are a few things you can do to reduce the din. Was convinced it was the mobo so we bought a new one. But since then sometimes the computer starts sometimes it doesn't. Hi, I am having trouble getting my new system to boot and am so frustrated. PC won't boot, fan starts and then stops What a nightmare, ... My Computers zbook. Opened the case. The power supply fan starts and the CPU cooling fan starts. Same behavior. Also please exercise your best judgment when posting in the forums--revealing personal information such as your e-mail address, telephone number, and address is not recommended. Adjust the power settings, let the computer cool for a few minutes, and then troubleshoot the noisy fan. Thanks for your help. Home PC won't start up with new motherboard. You could try replacing the CR2032 motherboard battery. I also tried without the RAM and it still did the same.The CMOS is in the normal position and I am wondering if maybe I should get a new battery to make sure.I am guessing it is down to the MOBO or the CPU.Thanks again for your quick reply, your help is appreciated. Computer Building: 1: Oct 8, 2020: R: Question Monitor went blank while playing a game. (The power light is on on the motherboard but when powered up the CPU fan spins for one second then stops). after this the PC started. I removed all of the chassis cables except the power switch and tried to flip it in case it was in backwards. If you're new to the TechRepublic Forums, please read our TechRepublic Forums FAQ. 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. pressing the power button had no effect. Computer Building: 3: Oct 28, 2020: J: Question Windows Starts Inconsistently, All fans stop when Windows loads then starts up again. A [software component] will damage your computer message displays when printing or installing - Click Here, Resolve Windows 10 or update issues on HP computer or printer– Click Here. The only thing that has worked is after booting, is to log into windows then shut it down through the start menu. 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 … Here’s how to control your PC’s fans for superior cooling when it’s working hard, and silence when it isn’t. ... Be gentle while cleaning the computer, note the fan-filled with dust. Remove CPU Power. You can also use a known working fan and plug it on your motherboard. ' ( see attached ) or have messed with the CPU fan spins for second... 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