I just experienced the 8600m GT video failure and am bringing the computer to Apple tomorrow. Over a year ago I replaced my stock drive with a WD scorpio black drive 320gb over a year ago. Do I need to swap out my WD for the original HD? I have a recent time machine back up of my data, but I'm more concerned about someone denying warranty service because I swapped out my drive. What have you guys been doing when bringing your machine in for service? Does it matter that my original drive has not been updated for over a year? THanks for your help.