HT3964: Intel-based Macs: Resetting the System Management Controller (SMC)
Learn about Intel-based Macs: Resetting the System Management Controller (SMC)
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Helpful answers
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Sep 23, 2013 8:59 AM in response to andrea825522by rccharles,* cmd-opt-p-r -- Zap PRAM. Hold down until second chime.
* cmd-opt-n-v -- Clear NV RAM. Similar to reset-all in Open Firmware.
let's see if you can get something on the display that doesn't involve the OS.
* cmd-opt-o-f -- Boot into open firmware
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.