This morning, I opened up my MacBook Air (13", Mid-2011) to find it had crashed in its sleep (something that had happened occasionally in the past), but this time when I pressed the power button to boot, it became stuck in a loop where the Start-Up Chime repeats over and over, while the screen remains gray. No Apple logo, nothing. I tried the usual Startup with Shift Key, zapping the PRAM, etc., but nothing.
Any thoughts?