screen went black during migration from time machine backup
Just did a clean install of Mavericks on my wife's 3-year old MacBook Air. I erased the hard disk first from the Recovery drive. Then did the Maverics install. All went well. Then I started a Time Machine migration from a back up I had on a Toshiba HD. Everything started well showing about a 2 hour back up time, but about 1 hour into the migration, the MacBook screen went black. I couldn't get it to go on, so I did a hard reboot of the system. I've had to start the migration again, but not I'm concerned the same thing will happen.
Any ideas what is going on?