Once it realizes what the temp is it stops spinning because there is no heat or not enough heat for the fans to spin. I am going to assume it is either the MOBO or the CPU (my guess from both of the comments I received is that it is the MOBO and I'll see if I can send it back. ‎07-13-2018 I was facing the same (or similar) problem about a month ago. The PSU tester shows everything as good. 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. Any advice on fixing the boot path problem? At this point, I've removed the video card, and still get the problem. after this the PC started. The memory was also removed and each piece was tried in each slot. Was convinced it was the mobo so we bought a new one. fyi. 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. You can also use a known working fan and plug it on your motherboard. Thanks for your help, but it has been a long two months and I am still stuck. CPU= AMD 3700+ (ada3700bnbox) mobo= Asrock 939s56-m When switched on the fans all spin … I removed it and everything booted up but no visual display or seemingly no activity. Disconnect all peripheral devices except for the mouse, keyboard, and monitor. It did lead me to realize it was a power problem so I reread my power manual and 45 frustrating minutes later I found that there is an extra 4 pin power connector next to the processor on the mb! etc. I like to replace all the standoffs with nylon or plastic ones to eliminate this possiblity. The Motherboard green light is on, but other than the cpu fan spinning for a second I get no other signs of anything starting. Were any providing a ground to the MOBO?? I took out the power supply and tried it on another motherboard (without any other loads). I powered off the system. Remove CPU Power. Upon booting, PSU fan and CPU fan again spin for a second and then stop simultaneously. 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. Same results suggests you have a motherboard issue. Thanks for all your help. Bought a PSU tester and everything passes on the PSU. I have returned the CPU and the Motherboard, both are new. Computer won't turn on. Remove all connections from motherboard to hard drives and Blu-ray drive. Time Required: It'll probably take around 30 minutes to clean all the fans in your computer, maybe less if you have a laptop or tablet, and more if you're using a desktop. Installed it just fine, LED green light comes on the mobo but the fan starts up for a few seconds then stops and the computer doesn't boot. 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. 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 on confirmed that the PSU fan was working ok. - I dusted the case, (it was not that bad anyway). Powered the system on. It seemed to work fine. I plugged it in and all is well. - edited - edited System boots, fans spin, system restarts, fans spin, system restarts, fans spin, etc. Same sypmtoms. My computer wasn't starting. ‎07-13-2018 When I hit the power button, the cpu and gpu fans spin up and them immediately stop. Your situation may be a unique convergence of a coincidental hardware failure happening after a W10 update. Then after at most 3 seconds, the power supply shuts down (both fans stop). Powered the system on. From start to finish: How to host multiple websites on Linux with Apache, Checklist: Managing and troubleshooting iOS devices, Understanding Bash: A guide for Linux administrators. If you're new to the TechRepublic Forums, please read our TechRepublic Forums FAQ. If it spins, then the problem is with your fan. Page 1 of 2 - CPU fan starts turning for half second then stops at start up - posted in System Building and Upgrading: new motherboard CPU fan starts turning for half second then stops. The second best is to try a different power supply.I assume that the clear CMOS jumper is in the "Normal" position.Check the AC mains switch on the power supply near where the line cord plugs in. etc. 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. It's good to narrow it down.That was a great idea to check the voltage switch, but it was set at 115. I've decided to go with a new computer. My search for an answer led me here, but this was a dead end. Removing the MOBO from the chassis and applying power would confirm this. Thanks for your help. 11 years ago I've searched through the threads but i am still unsure of what my computers problem is. Both service and cpu fans spin briefly then stop.. then this repeats on and on. I proceeded to run a diag test (F9) for each dimm using slot #4. Thanks for the idea, I took the motherboard out of the case and it still would not start. 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