Flip the switch at the rear of the PSU, and listen for the internal 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. also tried putting a fan on the … Press J to jump to the feed. I took out the power supply and tried it on another motherboard (without any other loads). The lights would come on, the fans would spin (case fan, cpu fan, power supply fan, video card fan). etc. Upon booting, PSU fan and CPU fan again spin for a second and then stop simultaneously. Press question mark to learn the rest of the keyboard shortcuts But the start button light remains on. When I press the start button, the light comes on. I dusted out the original PSU and re-installed it. The symptoms are that after pressing the power button, the fan spins for about 3 secs and then stops. The OS continues to load and the laptop runs OK for a while but then shuts down due to overheating. Remove all power to hard drives and Blu-ray drive. The fans actually go crazy, spinning at full force. There is no beep however, and no video. I removed all the RAM and powered on. It seemed to work fine. No change. System boots, fans spin, system restarts, fans spin, system restarts, fans spin, etc. 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. I've got an Acer Aspire 5332 laptop in for repair. etc. 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. The power supply fan starts and the CPU cooling fan starts. 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. 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. Powered on confirmed that the PSU fan was working ok. Thinking it was the fan itself, I got a replacement fan and swapped it out. Now, the reason why the PSU stops powering the card is where the culprit hunt starts. Same behavior. 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. The paper clip test is a crude but effective way to confirm if your PSU needs to be replaced. I replaced the onboard battery. Same fan issue persisted. Fan issue persisted. 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