sounds like something i had to go thru with my MBP too!
check this out:
http://news.cnet.com/8301-13579_3-10063844-37.html
this is what was going on with my computer and by the looks of it..it might be the same thing you're experiencing. MBPs that were built late 2007 - early 2008 were installed with a faulty videocard which affects the logicboard or something like that. For it to be replaced and serviced it wouldve cost like 500-600 bucks
but this is what I did to get it fixed........for FREE.
I called apple support... they have customer service representatives that trouble shoot mac problems with you on the phone. they ask for your serial number (located under the battery) etc etc.
I got a little aggressive on the phone, yet respectful...
basically my tone was... "..hey apple, I just dropped a couple grand on one of your computers, now how does one of your top of the line flagship laptops die in under a year!? ..what can you do for me..."
I sent them a link to a page in an apple support forum that addressed this known bug, im sure if you send the link above you'll get the same results...
they told me to take it to the place I bought it at and the service center will take a look at it.....if the problem matches the known bug... the service center will do the paperwork to clarify with apple and they will replace the part and service your machine....free of charge.
I was soo choked when my MBP died on me... after all that, I'm now a happy camper..
hope things work out for you
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