Sounds like a kernel panic, I had about 9 months ago on my MacBook.
It could be easy to fix, or in my case I needed to reformat the hard drive and reinstall the OS.
Anyways first off, did you upgrade the ram? If so try putting the old ram back in and restart.
If the ram trick dosen't work use these apple articles:
Mac OSX 10.5
http://docs.info.apple.com/article.html?...
Mac OSX 10.4
http://docs.info.apple.com/article.html?...
Mac OSX 10.3 & Earlier
http://support.apple.com/kb/TS1411
You may also want to take a look at this article (more complex)
http://www.thexlab.com/faqs/kernelpanics...
Hope This Helps!
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