Display and keyboard freezing

Recently, the display and keyboard on my PowerBook seems to freeze. The mouse stops working and so does the keyboard and the only remedy is to shut the computer down manually. Sometimes this happens as much as 5 times a day. I'm worried that there is a more serious problem looming. Is there a diagnostic I could run? Or is my PowerBook about to die? Thanks!

I suggest you first to reset PRAM and NVRAM and PMU. Then run ASAP Apple Hardware test because I got this problem 6 months ago and my mother board needs to be changed
Reseting PRAM & NVRAM: http://docs.info.apple.com/article.html?artnum=2238
Reset PMU: http://docs.info.apple.com/article.html?artnum=14449
Run Apple Hardware test:
1) insert your macosx DVD
2) reboot whilep ressing ALT key
3) when icons appears on the screen click on Apple Hardware test and run extended tests
Occsinaly you may look at you console log in utility folder

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