| remove a stick of RAM. Obviously if you have one stick in, add one and if you have two in remove one.
Power on the Mac and immediately press and hold command-option-P-R.
The system will restart with the ‘bong noise’, allow it to do this 3 times. On the third ‘bong’ you can let go of the keys.
The machine will now boot with a cleared password and reset PRAM/NVRAM.
You can then shut down the machine and reconfigure the RAM configuration as yo want it. |