Command + Option + P + R keys do not work

Hello world

I have a 2 models of macbook pro 2010. When I first got them I gave each a password firmware, but for some strange reason, one of them the password does not work! So I need to reset it. I read the forums where it says to remove 1 stick of RAM (fact), reset the SMC (which is), then hold down COMMAND + OPTION + P + R hown to reset the PRAM.

Problem is to keep these keys does nothing. The macbook starts just to the top as usual. GRRR! It's infuriating! I've tried everything. I also met several other MacBook & macbook pro in the past when he had the chip of ram only 1 I tried to case.have, 2 chips of RAM, Exchange autour, new ram, and 3 other different types of RAM, still the same problem. I have 2 x 2 GB ddr3 1333 mhz in there. I tried chips to 4 gb and 8 gb chips as well. Why the these keys are not suitable? I just don't understand and it's very frustrating because it works just fine on the other macbook pro and the specification and even the model is exactly the same thing...

I know that the keyboard is OK because the holding CONTROL + OPTION + SHIFT and the power button to do an SMC reset works very well. and Yes, I tried to connect a wired usb macintosh keyboard. These keys do not work either and I know that the keyboard is fine because it works on the imac. I find it confusing that google has no answer for that, surely someone else has had this problem?

You can reset PRAM with Terminal too: http://osxdaily.com/2015/12/16/view-clear-nvram-mac-command-line-osx/

Tags: Notebooks

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