My motherboard died on my MBP too, I had no video on the screen, but it still booted up in OSX fine. Apple replaced the motherboard, and my DVD drive too, all for free. 1200$ for parts, replaced for free = happy me.
I'll probably end up getting Apple Care, just incase something happens again in the future.
Time machine is also a lifesaver, makes backing up really easy, and saves a lot of time.
Lastly, I never actually saw good photos of replacing the HDD inside, so I'm pretty happy you showed them, was kinda skiddish about replacin... (
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