Two weeks ago I let Apple install a firmware upgrade for my new 13" MBP. Immediately it won't boot any more. Found out that putting the application disk in the optical allows a boot. Now if I repair permissions and disk on every boot I have no problems. Called Apple Care last weekend they said the problem has to do with the firmware upgrade and the only resolution is to reinstall the OS. ????????? What a pain. How much of my precious time off do I have to waste on my Mac? With Windows you reboot. With Mac you have to reinstall!! OK, I had to rant a little. Does anyone have a more acceptable resolution to this problem?