Random lock ups on my 17" 1.33....please help!

Well ive had my powerbook 17" for probably about 6 months and every so often it just decides to lock up forcing me to hold down the power button to reset it. Im not doing any heavy task i could be doing anything really, browsing a webpage or just chatting on aim. Ive used cocktail many times to try and fix it with no luck in fixing it. I really would rather not install a fresh copy of os x since i have everything just how i like it but this is just getting old. I had a 14" ibook and that thing never locked up once. This isn't like a mac and i was wondering if anyone had a solution or suggestion out there. Thanks in advance.
Ty

In order to isolate the cause of these lock downs it is going to be necessary for you to backup your data first. Please let us know when this is done, and we can proceed?

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