during the past two days, i noticed that my MBP won't restart. after mac os x wipes everything off the screen, i'm left staring at a black screen with the standby light (latch button) on. i had to hold down the power button to shut it off, before turning it back on. however, restarting the laptop from the windows xp (boot camp) partition works fine, so i am suspecting it's a software thing on the mac os x side. anybody has the same problem and managed to resolve it?