It did the exact thing. ... make sure it turns on and power the machine off. Only had PSU, CPU and 1 stick of RAM in. Took Mobo out of tower and placed it on cardboard. Once opened, you can clean the interior and remove dust with an air gun or canned air. I don't think I should do it with the system on.. 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. So I turned off the PC and went to find a MBR tool on my other PC. Refrain from spraying any cleaning agents onto any parts, as this can seriously damage a variety of components. The 2 second on-off cycle of fan and power light continues without any display or booting. This happened out … The fans start spinning but then they stop and it restarts all over again. Take the old CPU out and put your i5 4460 in. Powered the system on. 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. Same sypmtoms persist. Please see video below for what happens. 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 . • After clearing the CMOS values and before turning on your computer, be sure to remove the jumper cap from the jumper. Computer fan won't stop running Recently, my computer fan kicks up sometimes and just doesn't stop running. Both service and cpu fans spin briefly then stop.. then this repeats on and on. Same sypmtoms - I replaced the service fan. – 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 … Failure to do so may cause damage to the motherboard. 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. … Clean the CPU fans. For this step, you'll need to turn your computer off, unplug it from the power source, and open up the case. I powered off the system. Just did this. 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. 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. 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