Mine is 8 months old and I have already faced the same problem too for twice.
The screen blinks and I could see spots of black sides, and then it went off. The system is still running. I can confirm that. Because I know the sequence, and I could easily press the power down button once and press enter, the computers shut down itself.
I sent it to Apple Center, but they sent it back and didn't mention anything about my repair on the ibook screen. Sucks!