This morning, out of sudden, my MacBook Pro (15", 2007 model) decided not to start up anymore :-(. When trying to switch it on, I can hear the SuperDrive starting up and the sleep LED comes on (and stays on). After that, nothing happens - no grey screen, nothing. The guys at the Apple Store tried to run diagnostics and do a PRAM reset (which I had already tried), but to no avail - the MacBook just won't react. That was about all the guy did before he gave a quick diagnosis of logic board failure... I have a few questions that hopefully the MacRumors community can help me with: 1) Is there any way for me to verify that it is indeed the Logic Board that failed? I tried removing the memory chips and running the MacBook Pro only with one 1 GB of RAM (to check whether one of the chips is fried), but of course I wouldn't be able to tell if both are fried this way. Are there any other failures that can cause the same symptoms? 2) Is it normal for the Logic Board to be so damn expensive? They quoted me RMB 11430 (I'm in China, that's about US$1700). For that, I can already get a new laptop! Thanks for the help!