This sounds like a video problem matey because when your monitor has no RGB signal going to it , then it will say NO SIGNAL and even if your Screen res is set wrong you will still get your POST screen coming up on startup, check the obvious loose monitor cable , if not i would swap the video card to check it , wether it PCI or AGP , that's what it sounds like to me, if it were your Hard Drive a message would come up on your screen at startup saying Hard Disk Failure...
Hope this helps
Acestu
as ever!
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