If you can hear the fan, this should verify the power supply is turned on. Fan issue persisted. I replaced the onboard battery. The fans actually go crazy, spinning at full force. etc. The lights would come on, the fans would spin (case fan, cpu fan, power supply fan, video card fan). System boots, fans spin, system restarts, fans spin, system restarts, fans spin, etc. When I press the start button, the light comes on. The power supply fan starts and the CPU cooling fan starts. Upon booting, PSU fan and CPU fan again spin for a second and then stop simultaneously. Same fan issue persisted. Powered on confirmed that the PSU fan was working ok. 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. No change. I've got an Acer Aspire 5332 laptop in for repair. Press question mark to learn the rest of the keyboard shortcuts I've seen it all. It seemed to work fine. The paper clip test is a crude but effective way to confirm if your PSU needs to be replaced. Remove CPU Power. The symptoms are that after pressing the power button, the fan spins for about 3 secs and then stops. Same behavior. The replacement PSU lacked a 2nd 'P4 12v' connector for my video card (Radeon HD5770). also tried putting a fan on the … Press J to jump to the feed. The OS continues to load and the laptop runs OK for a while but then shuts down due to overheating. 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. There is no beep however, and no video. 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. Remove all connections from motherboard 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. Remove all power to hard drives and Blu-ray drive. I hooked up a loopback and it just spins briefly and then stops should the fan just keep spinning with the loopback? 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. I dusted out the original PSU and re-installed it. etc. Flip the switch at the rear of the PSU, and listen for the internal fan. Thinking it was the fan itself, I got a replacement fan and swapped it out. But the start button light remains on. 11 years ago In reply to Push start button, fan ru ... Hi Tyler, i have the same problem. 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