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The desktop won't reboot. The power light stays yellow. I hear a fan running, but the monitor says no signal.

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If your fan runs and the hard drive spins up, then you have a video card problem.
I'd do this: Disconnect everything inside the case but the CPU, memory, and video. Now try to boot. Also observe the fan on the CPU--does it spin?
If this fails, then your video has probably gone bad. Also--does your computer usually give you a "beep" when it starts up? If so, is it giving you a beep now? If not, you're failing the hardware startup test (POST).
So, your problem may be the video card. If your video is part of the motherboard, then you need to replace the motherboard.

Posted on Oct 01, 2009

  • Moustafa Rouby Jan 02, 2012

    the fan only run without pressing power key ok and the only thin happend that the fan run now sound no light nothing happen more and the hard doesnt spin do you think thats a mother bored ???

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Your monitor cable has been plugged out from cpu side or from monitor side plug it. It will start working

Posted on Oct 01, 2009

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