Actually what happened is I opened my cpu to clean out any dust so I cleaned it and even cleaned under the processor with a dry cloth.but when I tried to turn on the pc when everything was arranged,a black screen with a paragraph of error is shown.turns off the pc automatically. My motherboard is fine,it shows a green light in the extreme end. My processor is working great. Hard disk is also fine. But still it is not turning onn. Please help.