This happened out … It did the exact thing. Same sypmtoms persist. Just did this. Refrain from spraying any cleaning agents onto any parts, as this can seriously damage a variety of components. After reassembling the computer, I tried to boot it, but it won't start - the computer's fans (the normal one, the CPU's and the PSU's) went on for a second, and then off, repeating every three seconds. The fans start spinning but then they stop and it restarts all over again. – rnso Jun 2 '14 at 13:47 If you've gone through the rest of the steps above without luck then i would say it's time to replace the motherboard, most have a several year warranty so … 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. Only had PSU, CPU and 1 stick of RAM in. Once opened, you can clean the interior and remove dust with an air gun or canned air. The 2 second on-off cycle of fan and power light continues without any display or booting. Took Mobo out of tower and placed it on cardboard. Powered the system on. Sometimes it happens when I'm playing a mmo that takes up a lot of cpu, which used to be normal, but lately it kicks on when I hardly have anything running and have only had my computer on for about an hour or so. - I dusted the case, (it was not that bad anyway). Take the old CPU out and put your i5 4460 in. I don't think I should do it with the system on.. Please see video below for what happens. Clean the CPU fans. Opened the case. For this step, you'll need to turn your computer off, unplug it from the power source, and open up the case. Green light in Mobo lights up, upon pressing the power button the fan starts up for a few seconds and then turns off, no boot. 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 . Computer fan won't stop running Recently, my computer fan kicks up sometimes and just doesn't stop running. Same sypmtoms - I replaced the service fan. Both service and cpu fans spin briefly then stop.. then this repeats on and on. Failure to do so may cause damage to the motherboard. Now that the i5 arrvied I put it in but the PC won't boot. • After clearing the CMOS values and before turning on your computer, be sure to remove the jumper cap from the jumper. So I turned off the PC and went to find a MBR tool on my other PC. ... make sure it turns on and power the machine off. I powered off the system. Page 1 of 3 - PC does not boot, no (post beep, light, or display ) fans running - posted in Internal Hardware: When I boot my pc, all fans are running, no post beep, no pc display. Now when I turn on the PC it won't even get to BIOS, my monitor turns itself off and the CPU fan cuts out after 5 seconds. … No display is available when this happens, no beep code. 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