Well I installed a new hard drive on my 15" alPowerbook and everything went really well. It worked all night just fine but this morning the powerbook will freeze occassionally and I have to pull the plug to get it to restart. It seems to happen most when I start up a program but it also happened when I tried to reinstall Tiger when I was choosing the language at the beginning. So I hope this isn't my motherboard and hopefully a software issue but I have my doubts. I did install ffscroll which is supposed to give my older pb the scroll pad, but I can't think of anything else. Please help me. Thank you.