I Have a Powermac G4 But and the last time i tried to login under my name it crashes from there right after i hit enter to login. But what i am thinking is it could possibly this program i installed last night called traktor. the reason i think that is because the install quit right on me unexpectedly and i had gotten a message before that quitting the installer would leave the system unstable. So i think that is the problem. and i don't know how to fix it. Thanks in advance to anyone who can help me.