PowerBook went black after attempted disc insertion

I got really scared this morning, because my PowerBook just went black without any possibility to switch it on again. Now, it seems to work again.
This is what happened: I had several apps running, music was playing over my Airport and my computer was plugged into the power net.
I wanted to burn a cd, so I tried to insert one— with no success. For some reason the disc tray wouldn't grab it. I tried several times, but resorted to closing the PowerBook to make it sleep. I woke it up again after a few seconds, hoping to wake up the disc tray as well.
Nothing happened. No hardware sounds, no display, and no 'respiration light' to signify it was still sleeping. It seemed to be switched off. Trying to turn it on did not work for about five minutes.
I checked if nothing was overheated, the battery was alive etc. I tried to switch it on again and BANG, the disk tray made this horrible sound and everything was back to how it was.
Can anyone explain this phenomenon? Because I'm scared it will happen again or that maybe it's a permanent fault.
PS: Posted to wrong topic, can't migrate.

I have been burning cds succesfully again, so it must be a temporary error. I have no clue as to what might have caused it.
What was funny is that switching my machine on worked only after I had turned it upside down. Another post about a malfunctioning disc tray also mentoined this 'trick'.

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PowerBook went black after attempted disc insertion

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