There are three choices here...bad screen, bad connection, or bad video card, if the card is integrated onto the motherboard, then that part of the motherboard could be bad. If you have access to another monitor or a TV with a vga input, try the computer with another monitor. If you get a signal on that other monitor then you know you either had a bad connection with the other monitor or you lost the screen on the old one. Go back and reseat your video connections with the computer off. Don't ever remove or move cables to the monitor and video with the computer running...the screen can suffer permanent damage. If there is no signal on any monitor, then either you have a bad vga cord or your video graphics card had died.
Testimonial: "I followed the directions and I am leaning towards a bad vid card now. Thanks"
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