Computer starts up, but displays no pictures.

Hello,
I am in a pickle and in desperate need of help! I have a hp a6763w desktop that I had purchased from a friend. When he first got it, it was doing the same problem it is doing now. When starting the desktop the screen stays blank and does not display anything. He read online somewhere about replacing the power cable? I was just curious if anybody had any thoughts or answers to this because I desperatly need my computer. Also I replaced the video card in with a top dog one and took it out and tried just using the kn board vga and still nothing! Please Help! Thanks

Hi,
Return it to your friend and get money back. Problem solved.
Regards.
BH
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