I closed the cover to my HP Pavilion 900 Series and when I opened it later it had a white screen with dots and slash lines on a 45 degree angle across the whole screen. I rebooted and it went away. A week later the screen was light blue but withthe same lines. Anyone encounter that?

I've seen similar things happen with a video card that was prone to shorting out. I got it to stop after a thorough cleaning.

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