I'm having some issues with my iMac and I want to zap the PRAM to see if that fixes the problem. I tried the Command + Option + P + R during reboot multiple times and I can't get the PRAM zapped. It just boots as usual. I have a wired Apple Keyboard that seems to be working fine after I boot. I have a standard mouse as well. Any ideas on how to get it zapped? Is there a manual method through a utility or something or do I need to use the key combination? FYI, I don't believe that my other key combo's during bootup are working either (safe mode, single user, etc.). The machine itself is basically working OK. I'm having some issues with the display and I'm not sure if it is the graphics card, ram or the logic board. I wanted to start with zapping the PRAM.