Answer to: MacBook boots up to grey screen and nothing else?13" MacBook Pros have a Sata cable and Hard Disk Drive (HDD) problem. They fail! I have watched a MacBook Pro fail and the result is a Grey Screen Of Death (GSOD). I verified the HDD and the OS X Disk Utility report said the HDD was fine. Apple said that a Disk Utility verification is no indication of the status of the HDD. 2009 models are victim of this problem so yours may be something else.