MOVED: HELP! After defrag I boot get stuck at XP logo screen!

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HELP! After defrag I boot get stuck at XP logo screen!

i have some of your sypmtons for 2 days now... i have no idea what caused them...
i get the blue screen after rebooting, some apps don't launch or only launch after opening them 2 or 3 times. some apps crash that haven't crashed before... also i get the safe boot screen where one can enter unix commands, i enter "exit" there after loging in with my log and password... very strange...
i did the ram zapping thing described here on the forums, after no chenge i reinstalled the system from installer DVD and upgraded to 10.4.6 again, same thing happens again and again, sometimes i get the login window, sometimes i get the blue screen and only the mouse cursor and then i have to ctrl-apple-escape once or more to reboot...
i'm trying to repair permissions with disk utility, let's see if that helps....

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