After part 1 off installing Windows 8 it asks me to remove installation media (USB stick) and it re-starts.

when its at the windows logo it starts prepering the unit, at 75% the monitor shows this message (no signal detected)

I've tried safe mode, but windows cant complet installing in safe mode. and Im asked to re-start the PC and continue the installation

windows 8 have bean installed on this PC before.

problem solved!! the Videocard wasnt propperly connected, I also cleaned the RAM

VGA cable wasnt the problem it was the video card itself or the RAM

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