Okay so I just replaced the factory 320gb HDD in my early 2011 MBP with a 750gb. I went to boot from a Snow Leopard disc Apple sent me (I want to stay with SL) and I got the screen with the apple logo and then one with a little logo for the OSX SL download. When I clicked on that to start installing SL, my MBP beeped three times, then paused, then repeated the three beeps... So I did some Googling (on another computer that works, obviously) and found that three beeps, for some people, means a RAM issue. Another person said he'd been trying to boot from the wrong version of SL and that once he got the right disc, it worked. So I called Applecare and the woman told me there is only one disc version of SL (10.6) and that three beeps means there's a RAM issue (she said it needs to be re-seated). That doesn't make sense, as I didn't even touch the RAM when I swapped out my HDD. So I hung up and thought "***** it, I'll re-install the original HDD and see if it fires back up...if it does, it's obviously not a RAM issue." Well sure enough, everything works fine with the original hard drive back in. All I want is a bigger hard drive with Snow Leopard running on it! I can't take it in to an Apple store because I don't live near one, and this honestly shouldn't be that difficult anyway. Any ideas what the issue could be? The only other idea I have is doing a fresh install of SL on the old 320gb drive, making a Time Machine backup of that, then put the new larger HDD in my MBP and then clone the old Snow Leopard backup from my external HD? Would that maybe work?