Just got my first Mac (2.0 MB alu) friday. I got 4 Gigs of ram (OWC, from www.macsales.com). I installed it this morning with no problems. I was watching a .avi this afternon, when the screen went black (with the exception of some colored lines flickering at the top 1/2 inch of the screen). I shut it down, and restarted it. I got the boot up sound, the blue screen with the apple logo, then it did the same thing (except the screen stayed blue with the flickering at the top this time). Tried it a 3rd time, same thing. I opened up the back, took the new RAM out, replaced it. Fired it up, worked fine. It's now been working fine for about an hour with the new (4.0 gigs) installed. Any ideas? Can the memory be faulty, but work intermittently? Could it have been installed slightly wrong the first time or somthing? Any chance it's somthing else entirely? Thanks!