Page 1 of 2 - Fans spin for half second when cpu is installed. Other than that, no problem at all. Thread starter Reachable; Start date Apr 18, ... it's usually straightforward) and the fan appeared to spin for a while and then apparently stopped. The thing is that it doesn't make that noise all the time. https://www.youtube.com/watch?v=_ktrLPg-6rA. I have around 7 pcs with this problem. The purpose here is to remove as much hardware as possible while still maintaining your computer's ability to power on. I have returned the CPU and the Motherboard, both are new. - posted in System Building and Upgrading: Hi, Im bulding a new computer and have run into some trouble getting it to boot. Close. Press question mark to learn the rest of the keyboard shortcuts. New comments cannot be posted and votes cannot be cast. Any other issues other than noise? 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. In fact it's on right now and my GPU isn't even running. List anything you've done in attempt to diagnose or fix the problem. Be descriptive. Looks like you're using new Reddit on an old browser. Press J to jump to the feed. Try a weaker video card or a stronger PSU. Build a PC What happens when a PSU fan stops? When I power it on, the fans start, the green light on the back of the PSU lights up then the 3 & 4 LEDs on the front panel flash before the box turns itself off. We put in a new PSU in it but still no booting. Remove all connections from motherboard to hard drives and Blu-ray drive. Both GPU and CPU temperatures are pretty cool. Same behavior. Your PSU doesn't spin until it hits 20% of its total wattage. If your computer continues to turn off by itself, proceed to Step 11. http://www.corsair.com/en-us/hx-series-hx750-power-supply-750-watt-80-plus-gold-certified-modular-psu. Remove all power to hard drives and Blu-ray drive. 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. 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. Here's mine: http://www.corsair.com/en-us/ax760-atx-power-supply-760-watt-80-plus-platinum-certified-fully-modular-psu. I have tried unplugging the PSU and holding power for 30 seconds and that didn’t work. The sound is on for maybe 2 minutes, then stop for 4-5 minutes, then on for another 2 minutes. Posts: 46. The site may not work properly if you don't, If you do not update your browser, we suggest you visit, Press J to jump to the feed. PSU fan spins briefly then stops. New comments cannot be posted and votes cannot be cast. Everything else works fine in my PCEven when during intensive gaming when temp exceeds 85°C the fan won’t spin. Any help would be appreciated. Are you sure it's not just part of the "Zero RPM" feature where the PSU stops the fan under low temps? It's zero RPM until 70% of load, which is 532 watts. Builds: 2. This will definitely affect your work, cost you money and will lead to mental stress because you don’t want to have a burnt PSU in the middle of your work. All worked well for 2 weeks. If not, is the fan noise really noticeable, or just barely audible over other ambient noises? Planning on building a computer but need some advice? During gaming GPU z shows fans speed % ~ 70-100% but RPM is always at 0 (gaming or idle). Describe your problem. A short video showing how a PWM fan controller can mess with a non PWM fan. Do understand that opening the PSU is 1. dangerous, those capacitors can carry a hell of a shock, and 2. breaks any and all warranty. 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