HT1352: Setting up firmware password protection in Mac OS XLearn about Setting up firmware password protection in Mac OS X
HT1352 How can I disable Open Firmware account that has been enabled on my machine (Mac G5, OS X 10.4.11)?
Currently Being ModeratedHT1352 Re: How can I disable Open Firmware account that has been enabled on my machine (Mac G5, OS X 10.4.11)?Oct 26, 2012 1:56 AM (in response to mikehenden)
1. Shut down machine and unplug power supply
2. Fiddle with the RAM DIMMS. Specifically (carefully) remove a memory card and replace it. Be very careful that the static electricity from your person doesn't 'shock' the card. Wear an anti static strap or keep yourself grounded to the machine.
3. Once card replaced, restart machine holding down Opt+Control+P+R ('zap the PRam'). Hold keys down until you hear the Mac startup time three times. At this point the PRam has been wiped and you can relear keys. Password is wiped from memory.