Status Not open for further replies. Tried … I built my first PC like a week ago with no problems, updated bios and installed windows. Does the same thing, CPU fan spins for half a second and stops. And it won't turn on either way. Still does the same thing. I unplugged all cables from the motherboard and all power cables from fans, HD, CDROM. Troubleshooting. Notice the CPU fan spins for half a second and stops. Forums. B. bmc Honorable. Tried turning the computer on again, by using screw driver to short the power switch pins. Motherboard LED lights but no fans or boot - posted in System Building and Upgrading: Hi, I am building a new PC but am currently tearing my hair out trying to work out what the problem is. The keyboard would not light up either, only the mouse. PC wont turn on. My system is home built, the boot drive being a Samsung 850 EVO series m.2 SSD. Tried turning on the PC again. Fans spin for half a second and then turn off. Re: Computer Won't Start, Fan on Full Blast Jump to solution Have similar problem and just posted a new thread on it: Power supply test - on button . - letting it charge all night (with fans spinning). The fans were spinning loud but everything else just seems fine. Previous Next Sort by votes. Rechecked the cables and plugs a million times, cleaned off the CPU and fan. Power cord is fine, f10 will not start BIOS. Have tried all fixes listed. Idea was to reset BIOS. Here are my specs: ... Computer fan loud and won't turn on - … Dec 26, 2013 12 0 10,510 0. But as of this morning, turning it back on not only does that, it also sometimes causes it to shut off and reboot to the same problem by itself. 16 GB. Hardware. … Note: When I changed the Clear RTC jumper from Normal to Clear RTC, fans did not spin but Power LED came on. My problem is the same as many others I have seen listed. Everything worked fine until system required new heatsink/fan, and motherboard had to be removed from case. Thread starter bmc; Start date Jan 3, 2014; Sidebar Sidebar. [Solved/Closed] Report. Fans spin (heatsink, chassis) and power LED comes on, but no video. PC was working fine all these years, suddenly went to turn it on and loud fan noise, blank screen, pc won't boot. PC doesn't boot into Windows on 1st attempt in General Support Hi all, I'm new to this forum and have the problem of only booting into Windows at the 2nd attempt. Took off back, cleaned fans, redid thermal paste on CPU/heat sink. PC won't boot, fans spin, CPU LED lights up. Things I have tried: - unplugging the battery and charger, holding the power button for a minute, then plugging them back in and trying to start it. PC won't turn on. 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. Systems. 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