ML: Screen stays black when moving mouse and screen protector kicks in

This is the second time that this happens to me.
Setup:
MBP 5.4
2 monitors (extended)
ML 10.8.2 updated to date
Screen saver kicks in after X minutes
Require password after Y seconds after sleep / screen saver
I have set my protector screen to kick in after 10 minutes of inactivity and to turn the monitor off after 30 minutes. Normally, that isn't a problem but today I just happen to move the mouse (trackpad) when the protector screen kicked in, at exactly the same moment.
The expected behaviour would be that it would go back immediately to my "normal" screen, but instead the screen was just black, I could only see the mouse moving from one side to another. Any key sequence didn't help either. Waiting 5 seconds and than moving the mouse / pressing keys didn't help either. I finally had to hard-reboot the machine. (Pressing power button until it did go out, than boot it as normally).
What I didn't test was to press alt+cmd+eject key to force sleep (and then wake it again), but either way it should have gone back to my desktop instead of showing just a black screen without it doing anything else.
I'll be happy to cooperate if you need more information regarding on reproducing this problem.
Greetings.

excHi i have exact same problem i turn mine on i see power light hard drive light flashes one time i hear cdrom kick in no sound from speakers no picture so i am assuming no boot mine is toshiba satelite x200 so any help here would be great i have tested memory
nothing i have this bugger gutted at the moment i do now know after initial turn on the fans turn off after about 5 seconds i dont see nothing broke memory good i am assuming since when i take stick out i get orange flashing light no mater wich stick when i pop em back in it does the above again

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1. Shut down you computer.
2. Wait for about 30 minutes.
3. Boot in safe mode
4. Shut it down using the shut down button istead off holding the power button.
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Because I see that the processor isn't working when I try to start it up.
So let's say it's damaged, would that be the symptoms of my computer?
And if it's the processor, the only way to fix it is to send it to a reparator or something, because I don't feel like it, I'd rather do it myself.
But right now, my computer is simply not booting, like I said in my previous post.
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ML: Screen stays black when moving mouse and screen protector kicks in

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