My ibook g3 just came back from Apple, sporting a new logic board and new hard drive. I thought my computer was fixed so I started using it during the weekend. However, I noticed that my computer would make a humming and sometimes a screeching noise. When the noise got too loud, my computer would freeze for 5 minutes and return back to normal with the humming noises again. Before you accuse me of abusing my computer and committing fraud, I never did anything that would harm the computer since it was repaired from apple 2 days ago. All I did was go on the internet, check my email, play some low end games, and type my essays. I'm assuming this is a harddrive problem but how can that be if my hard drive was replaced?