My Mac: 2011 13" MBP, 8GB RAM, running Lion with full disk encryption. The scenario: When laptop is left asleep and battery runs down. Plug in power, switch on, enter password, see black screen with progress bar at bottom. Bar gets about a third of the way over, then I hear 3 long loud beeps, silence, then repeat. Only way to get out of it is to hold power down and start Mac from scratch. ANy ideas anyone?