I just got a powerbook, and immediatly added 2gigs of ram. I gave the 512mb stick to a friend who has the 15" 1.25 FW800 Powerbook. When he put it in. the computer started up ok, and acted fairly normal until he plugged the computer in. Once he did that there was an immediate kernel panic. So we restarted, and each time it would freeze during startup! We then reset the PRAM, with no luck. So we took the 512 stick out and the computer is back to normal! So, what would plugging the powercord into the powerbook have to do with RAM?? It is odd because the 2 RAM sticks (the one he already had, and the one I gave him) are EXACTLY the same. Same brand and everything. And it worked fine when it was in my powerbook. Any ideas?