I have a 2.2mbp os x 10.5.1 and after I wake it up from sleeping the computer works okay then freezes up and I have to hold the power button down and restart then it works fine. What should I do. I already did a clean install of 10.5. I did upgrade the ram to 4 gigs. Do you think its the ram. Is there any kind of hardware test? Anything would help. Thanks in advance and sorry if this is a repeated thread couldnt find it through search.