My SR MBP went to sleep last night and when I opened the lid, the sleep indicator remained on and I got no response from the computer itself. The screen would not turn on nor would the superdrive make the 'wake up noise'. I had to hold down the power button the shut it down. When I turned it back on I got an error message "Mac OS X has quit unexpectedly". Should I be worried? The computer is around 4 months old and is still in perfect condition.