Hey, my PB G4 crashes whenever I listen to music or watch a movie after about 2-5 minutes. When I do some text editing or surfing, it takes about 20-100 minutes till the display freezes. After an instant restart neither mouse nor keyboard works. I have to leave the PB turned off for some 5 minutes till it starts working again correctly. Anyobdy got an idea how to solve that problem ? I'm afraid that it's a serious issue.