My Early 08's 8600 failed recently (was still working but I got like 10fps on games and it failed the test) so I had it replaced at a few apple stores (an ordeal and frustration in and of itself). Anyways I was wondering if I need to do anything since the logic board has been replaced. Is a format necessary (for optimization and speed and for compatibility)? When I turned on my computer it gave me a warning about my clock being set to March 20, 2000 and a Y2K compatibility error. Should I be worried? All in all everything seems to be OK - unfortunately since my MAC addy changed I can't access Time Machine backups anymore and have to start a new backup Any help would be appreciated!