Thinking it was the fan itself, I got a replacement fan and swapped it out. etc. 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. Same fan issue persisted. It seemed to work fine. Same behavior. Remove CPU Power. also tried putting a fan on the … Press J to jump to the feed. There is no beep however, and no video. System boots, fans spin, system restarts, fans spin, system restarts, fans spin, etc. I took out the power supply and tried it on another motherboard (without any other loads). Same result.. the CPU fan would twitch, the power LED would come on.. and then shut off.. turn back on.. rinse, and repeat. I've seen it all. Flip the switch at the rear of the PSU, and listen for the internal fan. etc. Remove all power to hard drives and Blu-ray drive. I replaced the onboard battery. 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 removed all the RAM and powered on. But the start button light remains on. I've got an Acer Aspire 5332 laptop in for repair. Powered on confirmed that the PSU fan was working ok. The lights would come on, the fans would spin (case fan, cpu fan, power supply fan, video card fan). 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. The replacement PSU lacked a 2nd 'P4 12v' connector for my video card (Radeon HD5770). 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. Fan issue persisted. 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. When I press the start button, the light comes on. The paper clip test is a crude but effective way to confirm if your PSU needs to be replaced. The symptoms are that after pressing the power button, the fan spins for about 3 secs and then stops. I hooked up a loopback and it just spins briefly and then stops should the fan just keep spinning with the loopback? The power supply fan starts and the CPU cooling fan starts. Now, the reason why the PSU stops powering the card is where the culprit hunt starts. The fans actually go crazy, spinning at full force. 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