I have a Pavilion n5xxx, same thing happened to me. I believe it is the video driver problem. Reinstalled the video driver, the problem is gone. But after a while, it came back again. The other thing you can do it to use the recovery CD to go back the the original settings, problem is that you will lose all your data.
Compaq, Dell, and IBM are good choices if you want to buy in the future.
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Compaq, Dell, and IBM are good choices if you want to buy in the future.