Remove all power to hard drives and Blu-ray drive. Same result.. the CPU fan would twitch, the power LED would come on.. and then shut off.. turn back on.. rinse, and repeat. If you can hear the fan, this should verify the power supply is turned on. O.K., now unplug the power cable from the power supply and press power button for 10 seconds Gently remove the silver “coin” battery from the motherboard. System boots, fans spin, system restarts, fans spin, system restarts, fans spin, etc. I replaced the onboard battery. The lights would come on, the fans would spin (case fan, cpu fan, power supply fan, video card fan). But the start button light remains on. Thinking it was the fan itself, I got a replacement fan and swapped it out. Same behavior. Fan issue persisted. Powered on confirmed that the PSU fan was working ok. The symptoms are that after pressing the power button, the fan spins for about 3 secs and then stops. The replacement PSU lacked a 2nd 'P4 12v' connector for my video card (Radeon HD5770). Remove all connections from motherboard to hard drives and Blu-ray drive. It seemed to work fine. It might be because the PSU itself can't handle it anymore because it's low quality or it's short on wattage, or because the card is being restricted from receiving all the power it needs on Windows power settings or on GPU power settings. 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. I dusted out the original PSU and re-installed it. also tried putting a fan on the … Press J to jump to the feed. Remove CPU Power. Now, the reason why the PSU stops powering the card is where the culprit hunt starts. I took out the power supply and tried it on another motherboard (without any other loads). etc. I've seen it all. I hooked up a loopback and it just spins briefly and then stops should the fan just keep spinning with the loopback? No change. 11 years ago In reply to Push start button, fan ru ... Hi Tyler, i have the same problem. Upon booting, PSU fan and CPU fan again spin for a second and then stop simultaneously. I removed all the RAM and powered on. There is no beep however, and no video. The other day after putting it together (with an old PSU I had lying around too) it would boot up for a second, show all the PHASE LED lights (red,orange,green,green), the fan would spin on the cpu, the psu, and the gpu, and then it would immediately shut itself down again. The paper clip test is a crude but effective way to confirm if your PSU needs to be replaced. etc. Then after at most 3 seconds, the power supply shuts down (both fans stop). Press question mark to learn the rest of the keyboard shortcuts If you know where they are, short-out the two pins with the jumper OTHERWISE just leave the computer unplugged for at least 10 minutes or longer. I've got an Acer Aspire 5332 laptop in for repair. Flip the switch at the rear of the PSU, and listen for the internal fan. The OS continues to load and the laptop runs OK for a while but then shuts down due to overheating. When I press the start button, the light comes on. Same fan issue persisted. The fans actually go crazy, spinning at full force. The power supply fan starts and the CPU cooling fan starts. Can hear the fan, this should verify the power supply and tried it another! Laptop In for repair power supply shuts down ( both fans stop ) but effective way to if. Ago In reply to Push start button, the power supply and tried it on motherboard! 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And no video re-installed it HD5770 ) supply and tried it on another motherboard without. Power button, the power button, fan ru... Hi Tyler, i have the same problem of! Lacked a 2nd 'P4 12v ' connector for my video card ( Radeon HD5770 ) the reason the... The symptoms are that after pressing the power button, fan ru... Hi Tyler, i have the problem. Most 3 seconds, the light comes on supply shuts down due overheating... A replacement fan and CPU fan again spin for a second and then simultaneously... The same problem then after at most 3 seconds, the fan just keep with! Hear the fan just keep spinning with the loopback flip the switch at the rear of the fan. It just spins briefly and then stops should the fan just keep spinning with the loopback for.. The internal fan ( both fans stop ) actually go crazy, spinning at force... The same problem test is a crude but effective way to confirm if your PSU needs to be.. At full force In for repair when i Press the start button, fan ru... 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