How to detect faulty 12" PowerBook hardware

Hi everybody
An old buddy is selling his 12" PB and I'm thinking on buyin it from him.
Can you guys help me make sure I don't fall into a trap.... I used to have a 15" PB and I know for instance USB ports failure is quite common, and some say even RAM slots. Does the 12" has similar issues that I should particularly look for before I buy ?
Thank you all

Zenjamin: Just be sure the seller is providing the disks that were originally shipped with the Powerbook, and run the extended version of the Apple Hardware Test that you'll find on one of them. It will report any hardware problems that it detects. If any are reported or if the optical drive doesn't work at all, just walk away. If no problems are found, ask to use the computer for an hour or so and put it through its paces doing the things you'd normally do with it. If you don't see any display issues during that time (Apple Hardware Test can't test the video cable, display backlight or LCD panel) and the price is right, go ahead.
Personally, I'd never buy a computer from anyone who couldn't or wouldn't include the correct DCs/DVDs that originally came with it, in good condition. Someone who has kept those discs filed away safely for several years is far more likely to have taken good care of his or her computer than someone who has lost the discs or can't understand why I'd want them.

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