This machine was given to me, working slowly, and freezing in windows when it got hot. I took it apart, to get the dust out of fans and grates and what not, and now this. It powers up, and all three fans run. But I get nothing on the screen, no hard-drive activity light, and even the green light in front that used to illuminate when the power was turned on no longer does. any suggestions?

Does POST beep to indicate evrything is working and also have you checked whether the connections you disassembled are connected okay

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