How do I reset the PRAM of my MacBook Pro in OSX Mountain Lion?

Dear all, I bought a new MacBook Pro 13" (Mid 2012, MacBook Pro 9,2) and upgraded the OS to Mountain Lion. There have been some crashes (apparently related do Chrome), so I wanted to reset the PRAM to "clean up" a bit, but it didn't work. I made sure I followed the standard procedure (as in my old MacBook Pro 15" Late 2008, which was stolen), and held properly the CMD+OPT+P+R combination before getting the grey screen. Just to be sure, I tried shutting down and turning on again and also just restarting my Mac. Neither worked. What may be the problem? Thanks.

The fact that Apple saw fit to put out a ML-specific PRAM-reset note confirms that the key sequence is unchanged. Yet I've witnessed quite a few instances of people complaining that it did not work on that OS. Will try when I get on my testbench later tonight. But still seems odd to have such a recurrence of the same complaint.

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How do I reset the PRAM of my MacBook Pro in OSX Mountain Lion?

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