i sintalled a 512mb ram in my G4 iBook and ive beenusing it for about 30 minutes since. so far Halo and the system profiler has crashed and while playing halo again, it froze again with a black box and an error message instructing me to hold the power button for several seconds to restart in like four different languages. never did see that before. hope this ram isnt messing up my computer. BTW its from Centon and i bought a PC2700 512mb.