Apple Event: May 7th at 7 am PT
When i push the power button to start my mac pro is whirls for a second and stops. I think i was once told that is i hold down a cowple of keys and then push the power button it would start. Will this work? If l yes then what are the keys i need to hold down. Thanks in advance. Ed
iMac, iOS 5.1.1
You may be thinking of the PMU reset button. See last article on first page here:
Power Mac G5 Blank screen and no chime on start up
also...
Sometimes if volumes don't appear in Startup Manager (what you get when you hold down the Option key at startup), you need to reset the Mac's PRAM, NVRAM, and Open Firmware. Shut down the Mac, then power it up, and before the screen lights up, quickly hold down the Command, Option, P, and R keys, until the Mac has chimed twice more after the powerup chime.
Then, before the screen lights up, hold down Command-Option-O-F until the Open Firmware screen appears. Then enter these lines, pressing Return after each one:
reset-nvram
set-defaults
reset-all
"The reset-all command should restart your Mac. If so, you have successfully reset the Open Firmware settings."
http://support.apple.com/kb/TS1812?viewlocale=en_US
Should the fail...
Try taking the battery out for 10 minutes. Put battery back in. Cross fingers. Power the machine back on.
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