by longvue2. Being involved with EE helped me to grow personally and professionally. Experts Exchange always has the answer, or at the least points me in the correct direction! 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. 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. I've seen were the wrong plug is put across the reset connector or the reset button is stuck on. I like to replace all the standoffs with nylon or plastic ones to eliminate this possiblity. Please remember to be considerate of other members. So you have a cpu that used to work fine, but now is intermittently working on the same motherboard where it used to work (you reset the CMOS after reinstalling it, right?). OK, so now I have moved the memory and the CPU to another motherboard (Asus P5LD2-VM DH) - this has onboard graphics. However, on further inspection, the fan spins a little then stops. PSU is most likley dead, use the warranty and RMA it. the fans will spin for a second then stop. ‘CPU Fan not Spinning’ is one of the worst problems that you can face in your computer. I scrounged up a good PSU from someone and it did the same thing. The lights would come on, the fans would spin (case fan, cpu fan, power supply fan, video card fan). Fan on motherboard spins for a few seconds then stops, no boot. 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. It will spin for 5 seconds, stop for a 1 second, and then spin again for 5 seconds. Our community of experts have been thoroughly vetted for their expertise and industry experience. 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. Change the CMOS battery and see if it works. The motherboard is an AM2+ system and the chip seemed to fit fine. Our community of experts have been thoroughly vetted for their expertise and industry experience. Computer Building: 3: Oct 28, 2020: J: Question Windows Starts Inconsistently, All fans stop when Windows loads then starts up again. save. We've partnered with two important charities to provide clean water and computer science education to those who need it most. Waited , then back to pins 1/2 and replaced the battery. 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. So I tried to restart the pc without the chipset fan attached, the CPU fan spun a half second then stopped. Experts with Gold status have received one of our highest-level Expert Awards, which recognize experts for their valuable contributions. Fans spin for half a second and then turn off. Both service and cpu fans spin briefly then stop.. then this repeats on and on. I am in the process of building a computer and ran into a snag. I do not get any POST beeps. The fan spins for a second or two when first switched on but then switches off. Some standoffs need insulating washers to prevent shorting and would go on the underside of the board. Thanks for your help, but it has been a long two months and I am still stuck. P.S. I would try a better quality power supply. Or were some standoffs shorting the power supply?? Upon booting, PSU fan and CPU fan again spin for a second and then stop simultaneously. The PSU tester shows everything as good. ALL RIGHTS RESERVED. Does the same thing, CPU fan spins for half a second and stops. CPU fans got loud noise like spin very fast? When I go to hit power, the fans spin a second and then stop. Get a good Seasonic 600w (or even their new 700w unit). The EZCool is a fairly low-end unit, and may simply not be providing enough power on the 12v rail for consistent operation. Thinking it was the fan itself, I got a replacement fan and swapped it out. Thanks for the comprehensive reply thoffman. 11 years ago In reply to Push start button, fan ru ... Hi Tyler, i have the same problem. No such thing on all my previous single processor machines. 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. The CPU fan spun like before but no beeps or anything. Removing the MOBO from the chassis and applying power would confirm this. Please note: Do not post advertisements, offensive material, profanity, or personal attacks. New build, fans spin for a sec, shuts off! 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)? Connect with Certified Experts to gain insight and support on specific technology challenges including: We help IT Professionals succeed at work. I am in the process of building a computer and ran into a snag. CPU fan spins for a second and stops. All the case fans still spin and the computer continues to run for a few min then over heats and quits. Codes 32-36 are CPU PEI initialisation. I also tried another PSU. how to redirect internet via rasberry pi. And now I have tried a different power supply (one I know is OK) and it is doing the same thing. Log in … Does the power supply need anything else plugged into the motherboard other than the 24 pin and 4 pin ATX cables? I took off the back to ensure it was fully plugged in and it was. READ MORE. I plugged it in and all is well. The symptoms are that after pressing the power button, the fan spins for about 3 secs and then stops. 100% Upvoted. Then a blinking blue light comes on. 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! Fan on motherboard spins for a few seconds then stops, no boot. I have returned the CPU and the Motherboard, both are new. When asked, what has been your best career decision? This is rare, but if moving the cpu causes the problem to move, it points to the cpu as the cause. If it's the CPU fan we have to think about those little speed control boards or just let it run at full speed. I thought I have ruled out everything, so I am a little lost. > a colleague has confessed that he fried the P5LD2 last week, https://www.experts-exchange.com/questions/22061341/CPU-fan-spins-for-one-second-and-then-stops.html, https://www.experts-exchange.com/Hardware/Desktops/Q_22060296.html#17942625. I have tried unplugging the PSU and holding power for 30 seconds and that didn’t work. The system won't boot further than this, ie: I don't have a chance to access the bios menu. Now, when I first booted up the PC the CPU fan started spinning and all seemed happy (hence me awarding the points on the other question) - until I installed the graphics card - then the problem returned. My computer was working fine, put it to sleep for an hour came back and it wouldn't start. You can make sure that the system isn't too loud, with the fan only spinning up faster when your PC gets warm. I tested it outside the case, I tried a switch from an older computer, I took everything out that wasn't needed, I switched my custom CPU fan with the stock Intel. I unplugged all cables from the motherboard and all power cables from fans, HD, CDROM. New workstation, fans spin for about 1 second then nothing - posted in System Building and Upgrading: Hi all and thank you once again for your precious replies. 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. The fans actually go crazy, spinning at full force. Remove all RAM and try it again. 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. 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. Thanks for your help. 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