Wish I had a suggestion for you but I don't. Maybe take it to a repair shop and let them test your hardware. Could be a video card problem. With the age of the computer I don't know if it would be worth the money. You can get a new laptop running XP for less than $500 these days. The repair shop would probably charge a couple of hundred if it's fixable and you'd still have an outdated OS and hardware.
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