Thanks. how to redirect internet via rasberry pi. Remove all power to hard drives and Blu-ray drive. I may not be understanding what you did - did you have a cpu from another system, and did you try that cpu in the Asus P5B motherboard (after resetting the BIOS)? Alright, so I have an AMD system. by longvue2. Waited , then back to pins 1/2 and replaced the battery. After I installed it and turned my computer on however the CPU fan spun for a brief moment then stopped and the system didn't boot. The CMOS has been cleared and I removed the motherboard and put it back in with new screws and standoffs. on ... Also I assume your talking about the CPU fan correct? Does the same thing, CPU fan spins for half a second and stops. ... and that stopped the fans from running at a high rate. CPU fan spins for a second and stops. CPU fans got loud noise like spin very fast? this action keeps repeating. Try resetting the CMOS - your cpu may not be recognized by the motherboard. When turned on, it makes all the right noises etc and the fans start to spin up, then they start slowing down and just stop. It might sound a little strange but it helped me. I'm 99% sure it's something to do with the graphics card - I had tried adjusting it to make sure it was sitting right and then it suddenly booted fine, but then started turning off again after I rebooted. You need to be meticulous about reinstalling, to make sure the cpu is flush against the socket and all connections are snug. Replacing the standoffs may be an issue. When I go to hit power, the fans spin a second and then stop. Computer Building: 1: Oct 8, 2020: R: Question Monitor went blank while playing a game. Right, I have put the CPU back into the older PC that it came from and it boots fine, does this eliminate the CPU? It will spin for 5 seconds, stop for a 1 second, and then spin again for 5 seconds. So I tried to restart the pc without the chipset fan attached, the CPU fan spun a half second then stopped. (Unlock this solution with a 7-day Free Trial). Thanks, your right, it was that. Thank you for the ideas. All submitted content is subject to our Terms Of Use. 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. 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 recently found out that after experiencing high CPU temps, that my CPU fan was not spinning. The fans actually go crazy, spinning at full force. This award recognizes tech experts who passionately share their knowledge with the community and go the extra mile with helpful contributions. I have tried the CPU, power supply and memory with another motherboard (Asus P5B) and sometimes the same problem occurs but sometimes it does seem to boot up - the problem is that with this motherboard (which doesn't have onboard graphics) as soon as I plug in a PCI-E graphics card the CPU fan spins for one second and then stops! This conversation is currently closed to new comments. Remove all RAM and try it again. Move the other cpu to this motherboard and see if that works. READ MORE. PSU is most likley dead, use the warranty and RMA it. Thanks for the comprehensive reply thoffman. Is it set to the correct line voltage?In the US, it should be set to 115/120.You can power up without the RAM installed and see if you get the no RAM POST beeps from the system.Without parts to swap, there is little else I can suggest you check.Chas. Controlling the CPU fan speed in your PC (or all the fans, in fact) is a way to give you more control over your Windows 10 experience. Now when the computer starts up the Heatsink fan spins for 2 seconds and stops. I removed it and everything booted up but no visual display or seemingly no activity. Both service and cpu fans spin briefly then stop.. then this repeats on and on. Yes, it was working prior to me building the new PC - today I have put the CPU back in the old PC and verified that it boots correctly. I was facing the same (or similar) problem about a month ago. Thanks for the idea, I took the motherboard out of the case and it still would not start. Does the power supply need anything else plugged into the motherboard other than the 24 pin and 4 pin ATX cables? PS I have given up on the P5B for now as it doesn't have on board graphics - I want to try and get it working on the P5LD2 first which does. Worst problems that you can make sure the CPU fan we have to think about those speed... Be meticulous about reinstalling, to make sure that the system is n't too loud with. 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