I'm trying to help my roommate with her MacBook. She has a 2008 Aluminum MacBook, the standard 2.0Ghz model. Occasionally when she moves the screen or tries to angle it, it flickers. This doesn't happen every time. I honestly haven't tinkered with any Mac laptops once the unibodies came out, so I am hoping someone can shed some light, give some advice, and maybe throw out some ideas for repairs. She doesn't have a lot of money, so any frugal solutions are appreciated. Thanks.