Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5) I just had my 2011 i7 boot up with the infamous 3 beeps (ie bad RAM, according to the Mac.) It's weird as the computer and RAM had been working nicely since Thursday. The RAM was pulled from my 09 iMac. Yes it is proper 1333MHz RAM. Worked flawlessly in there since May 2010 when I installed it. Here's the thing. I've run memtest from single user mode, 3 passes, all good. I'm on my 6th extended looped pass of AHT and no errors so far. I can have the iMac boot with the beeps at will though by resetting the PRAM three times in a row. First reset - bong Second reset - bong Third attempt to reset - beep beep beep It won't boot again properly until I unplug the power cord and reconnect that (effectively resetting the SMC.) I have reseated and rotated my RAM three times now to no avail. Not sure what to do. Any idea why it is sporadically saying my RAM is bunk? Any other troubleshooting suggestions?