The maximum time I have been able to have it on is ~ 8 days. It either hangs, gets stuck on a blue screen or something. I've tried resetting the PRAM, checked the permissions and ran Onyx nothing helps. Every week I have to force a shutdown. Any ideas on something else I should try? Also I bought a new MBP (not because of this issue) should I use Migration Assistant or should I manually install the applications? I wouldn't want to transfer whatever problems this MBP has to the new one. MBP is a 13" 2009 with 10.6.3, everything up to date. Thanks.