My macpro is stuck in a firmware update. The progress bar never showed up after holding the power button down and seeing the light blink and hearing the long beep. This Macpro does not have a raid. I have burned a firmware restoration disk and am using these instructions from Apple to attempt to get my machine working again. http://www.apple.com/support/downloads/firmwarerestorationcd11.html However I cant get my MacPro to even open the drive slot. I have rebooted by holding down the mouse button and also by using option, but no dice. Any suggestions?