Computer turn on but no display

Hi guys,
So yesterday i cleaned my pc because it was not starting and giving no disk detected error so i cleaned it but when i put it back i plugged in the pc and suddenly cpu start running without pressing the power button so it started but i couldn't see any display on the screen it said no display i changed my vga cable but still it gave no signal i cleaned my graphic card again to make sure but still no signal recently when i started it again my cpu fan started running so fast and then again it turned off i pressed the power button several times but it didn't started then i pressed and holded the button it started running but no display and i could here fan running very fast what can i do??
Please help!!
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More about computer turn display
  1. Start HERE:

    (IMHO that thread should be a sticky on every forum where noboot/nopost-questions come up)
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