Pressing and holding the power button

Discussion in 'Mac Pro' started by Neonguy, Oct 26, 2006.

  1. Neonguy macrumors 6502

    Sep 10, 2006
    What it is for if you press and hold down the power button on a Mac Pro? The light flash really fast and make a really loud beep. I know this is use for Firmware upgrade, but I try to restore a Firmware update but couldn't. I try holding the power button while the computer start up see what it for but I get a blank screen afterward. Is this going to screw up my Computer? I force shutdown already and already went back to Mac OS X just fine.
  2. Superdrive macrumors 6502a


    Oct 21, 2003
    Dallas, Tx
    If you are back in Mac OS X already and it's working fine, I wouldn't worry about it. You should only have to shut your Mac off that way after a hard lock or kernel panic. If you are trying to apply a firmware upgrade, try and follow the software instructions again. If it went positively before, it would most likely tell you.

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