So... I got this MBP last tuesday, new, clean install of Tiger, etc etc. Today my Leopard up-to-date upgrade DVD arrived, and I installed it. I noticed some animations were choppy, but other than that, it seemed fine... So I've been hopping between OS X and Windows (maybe two or three times) today, going through the proper shutdown/restart procedure, and the last time I tried rebooting, my OS X partition just hung at a blue screen with a cursor, not bringing up a login prompt. What do I do? edit: Oh... I should probably mention I installed ApplicationEnhancer.