1.) Install a video card (maybe one of your friend's card or a new one), then disable the on board graphic adapter in the BIOS! At last install the required video driver!
2.) If the problem still exists then the video card is probably not the problem.
3.) If not then buy a video card (if not already done) and repeat the procedure from the start (1.)!


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Greetings from Frankfurt (Germany),
Sheriff ;-)