[Fenny288]

I left my computer on last night and when I woke up this morning the screen was black. This usually happens to conserve power, but it usually wakes up when I move the mouse. It didn't. The monitor is on and still backlit, but shows only black (no cursor or anything). It didn't visibly or audibly respond to anything so I gave it a hard reboot. On startup, the screen briefly shows the HP symbol (as usual) and then a black screen with a little white horizontal line in the upper left corner for a few seconds, and then it's just black. It's an HP Pavilion laptop running the XP that came installed when bought two and a half years ago.

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Can you see anything on the screen when you shine a flashlight onto the screen?
Did you try to boot into Safe Mode?

[Broni]

Can you see anything on the screen when you shine a flashlight onto the screen?
Did you try to boot into Safe Mode?

[Fenny288]

Restarted in Safe mode. Everything seemed to work fine. Then restarted in regular mode and it started fine. The problem seems to be gone. Any ideas on what caused it in case it happens again?

[Broni]

Ii it happened just once, I wouldn't worry much about it.
If it'll happen again, feel free to post back.