What defects should I look out for on a new C2D MacBook?

Hi all,
So, here's my Mac story. I've had macs for the past 4 years, I just like working on them when I have the option. When the new MacBook came out last Spring I immediately bought one, and then 3 returns laters, I got one that wasn't falling apart and was happy. Then the C2D came out, and I was antsy to upgrade. I know it was foolish but I talked myself into a MBP C2D. I got that, about 2 weeks ago and was very dissapointed in the display, grainy and all. So I talked to apple and they're taking it back. But here I am with no laptop again. SO I purchased a new C2D MacBook, and it arrives today.
So back to the question ... what defects with the new one should be on the look out for? It's difficult to figure out which MacBook people are talking about when they talk about their problems.
Thanks for the help

To be honest, you shouldn't be looking for any defects. There were some problems with a small percentage of the original MacBooks which have since been resolved and should not appear on the new Core 2 models. Get your MacBook and enjoy it. If you discover something is not working the way you feel it should, address it then. To be on the look out for problems that you may have heard others having is only going to make you worry and probably think you have found a problem where none may exist.

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