I'm pretty sure my gpu on the MBP just crapped out on me. Same thing just happened to my brother's a couple months ago. Screen went black after restart, PRAM reset and hooking up to external monitor did nothing. I'm taking it in tomorrow. OK So my question is: What exactly did they replace it with? It's the gpu thats f*cked, so did they replace it with something new or just give you another 8600mt? Thanks!