MBP display flashes on and off, then the MBP freezes

Recently, my MBP started acting up. I can't figure it out. The display will go black, then will return to normal (over and over). After awhile, it just freezes. Any ideas?
PRM
MacBook Pro 1.83Ghz, eMac G4 1.25Ghz, iBook G3 600Mhz Mac OS X (10.4.7)

It could be a power inverter problem, but you might try a disc repair to see if it's software related.
Start in single user mode by holding down Apple/S at startup
When you see scrolling text let go of the keys
When the text stops and you see a #root: prompt enter
fsck -fy
and hit return
Let it run through all the checks and repairs; if it fails first time run it again, if it finds and repairs anything run it again. (Some fixes can take a few passes) When it says "appears to be OK" enter
reboot

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SOLUTION!
I've been suffering from this problem for a few months. I tried everything suggested by everyone, and then, today, I had a mad idea.
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MBP display flashes on and off, then the MBP freezes

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