My powerbook g4 has been crashing alot when it gets hot, but doesn't when i try to run disk repair. The fans still work since it pops on during WC3 and stuff, but crashes randomly sometimes. I was reinstalling (clean install) but it keeps on freezing at 99%. In the end i put an ice pack on the bottom and it finished. But the promblem still exists. Harddrive? Logic Board? RAM?