Please see video below for what happens. 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. – 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 … … • After clearing the CMOS values and before turning on your computer, be sure to remove the jumper cap from the jumper. Now that the i5 arrvied I put it in but the PC won't boot. I don't think I should do it with the system on.. It did the exact thing. 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. I powered off the system. Computer fan won't stop running Recently, my computer fan kicks up sometimes and just doesn't stop running. Take the old CPU out and put your i5 4460 in. Same sypmtoms persist. Powered the system on. Opened the case. 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. This happened out … Always turn off your computer and unplug the power cord from the power outlet before clearing the CMOS values. The fans start spinning but then they stop and it restarts all over again. Refrain from spraying any cleaning agents onto any parts, as this can seriously damage a variety of components. For this step, you'll need to turn your computer off, unplug it from the power source, and open up the case. Clean the CPU fans. 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. Took Mobo out of tower and placed it on cardboard. Only had PSU, CPU and 1 stick of RAM in. ... make sure it turns on and power the machine off. Just did this. No display is available when this happens, no beep code. 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 . So I turned off the PC and went to find a MBR tool on my other PC. 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). 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. Same sypmtoms - I replaced the service fan. Failure to do so may cause damage to the motherboard. 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