Okay, a friend of mine has a 450mhz G4 tower and is having issues. If he tries to boot up regularly, the computer just goes right to a screen that says "you have to restart your computer" in lots of languages. If he tries to start up from diskwarrior, the he gets to a screen where it asks him to choose a boot disk, but his mouse doesn't work. If he starts up in safe mode, the computer will boot to the desktop, but if he tries to open anything, he just gets an endless spinning beachball. Interestingly, in this situation the mouse works fine. He has tried swapping out his ram chips, but the problem persists. Before all this happened, all programs were crashing often and randomly. Can anyone diagnose what the problem is here?