Have you tried this? Feedback from the comments in the article says it works:
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Add or remove a stick of RAM. Obviously if you have one stick in, add one and if you have two in remove one.
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Add or remove a stick of [https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Early+2011+RAM+Replacement/5117|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 you want it.
have you tried this, feed back from the comments in the article says it works;
Add or 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 shut down the machine and replace the original ram configuration.