My first "what the **** just happened?" moment with a Mac. I just installed the EFI update for my Air through software update and it went super quick and went to reboot. That's when the fecal matter hit the fan. As soon as it shut down I got a loud 5 second buzzer. I started to freak and then it stopped and about 3 seconds later I hear the startup chime. I think that maybe it was just a freak thing and hope it all boots up fine. It doesn't. The boot screens comes up with the Apple logo and a progress bar underneath. But as soon as I see it, it shut down againg and goes into a resart cycle where it chimes, the boot screen pops up and then restarts over and over again. I did the only thing I could think of doing which was to hold the power button down until it stopped trying to boot up, which it did. So then I hit the power button again to see if it will do the same thing before I call Apple. Well it boots up fine and everything powered up normally and seems ok, but what the heck was all that about??? Should I call Apple and see what they say? ---------- Just noticed that it looks like the EFI Update did NOT install. It is still showing up under Software Update. What should I do? Try it again?