Can Anybody Help Me??

[bixbeats]

I have a PowerBook G4 that i bought from my homie and it i love it. i know that a lot of these had screen problems, however, mine has a new screen and runs like a champion. Recently though, I turned my computer on and the desktop screen is off center--as a result the icons on the far right are pushed out of the picture and can't be accessed with the curser. also, the tool bar is almost invisible, all that can be seen is the very teeny tips of the icons. the time and date in the top right hand corner are also pushed out of the screen. everything else works fine. Sometimes if i reset it it will turn back to normal, but that rarely works. Does anyone know if there is a way to alleviate this???