I tried to post this in the Apple support forums but their post option is missing... Anyway. I was having graphical issues with my MBP(lines, garbled pixels on icons, etc.). After Disk Utility repairs and finally a complete re-install of Leopard I took it into the Genius Bar. They couldn't recreate the problem, as you need to use it consistently for about 30 minutes for the problem to start, so they never fixed it. I got it home and the problem consisted (of course, since they didn't do anything). I took it back in last week and the genius who helped me just put the order in to replace the logic board and not to try to replicate it. I got the MBP back yesterday and they had replaced the board and now all of my graphical issues are gone. However now at completely random times, plugged into power or not, it will just turn off. Not sleep. Completely turn off. I hit power and it boots back up just fine. It doesn't seem to be related to any particular application either. Any suggestions? As it's a 2 hour bike ride to the nearest Apple store, I'd like to figure out a way to fix this without having to go back out there for a third time. My specs are: 2 GHz Intel Core Duo MBP 15'' ATI Radeon X1600 2 GB RAM Leopard 10.5.7 Also, the techs left the 'Blank Board Sanitizer' disk in my optical drive. If that could help me... Thanks for any help!!!