PKRAM is holding down a sequence of keys right at start-up, waiting for the start-up chord to sound five times, then releasing. It resets a number of things in your system folder to factory specifications and is great for clearing out old memory sectors no longer in use. I do it by rote, so Ill have to look up the exact keys. Just now, I tried to remember what they were, and of course, couldnt think of what felt like the right combination.