I have a PowerMac G5 and it refuses to boot into Open Firmware. I used Command + Option + O + F and held down the Option key. I have tried 3 different Keyboards but no avail.
PowerMac, Mac OS X (10.4.11)
But the 4 PRAM Reset keys, did you hold them all down for several minutes???
Sorry, just reread it & understand it differently... out of ideas at the moment.
Completely tried. Held to login screen. No tone.
Hmmm, might try it with no RAM installed.
How to reset the SMU/PMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
http://support.apple.com/kb/HT1436
Earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
http://www.macusersguide.com/2009/05/resetting-pram-nvram-pmu/
PowerMac G5 will not boot into Open Firmware, or Boot Manager
