I was streaming Hulu and fell asleep. I woke up the next morning and turn the Macbook off; went to work. Turned it on...

The problem is that I've done that and the internal hard drive does not show... it's literally not visible. I am running the latest Mountain Lion OS X update as well. I can\t recover the hard drive. In DU it shows to left as "disk 1". I can't use the external HD as as a source and the "disk 1" as the destination to erase and rewrite. It says that I don't have enough memory lol.... I'm just ready to buy a different HD to replace it with and reload from the external HD. But then I am wondering how to wipe the old external hard drive clean since it won't be in the laptop.

I just ran into the mute stuck problem with my mid 2010 MBP. What's funny is that the power comes back on and there IS sound, unles there is a different speaker for the start up chime. But anyway, my issue... Muted spound problem; No red light. I looked at different solutions: - insert something possibly (but w/o a red light I didn't want to try) - Reset the SMC (it didn't help) - Repeated in/out of head phones (didn't try but 3x's figured it would offer little success) - FIND A FRIGGIN' REAL FIX through the keyboard command (which I found mentioned by chance some where else) Now I have it.... IT'S SIMPLE These are the initial directiions... power off >remove all peripherals > remove battery > hold down power button for 10 seconds > re-install battery> hold down APPLE/ALT/P/R hit power hold down for 4 cycles. What I did for my MacBook Pro was only part of the directions... power off >remove all peripherals > hold down power button for 10 seconds (once it chimed on) > immediately held down APPLE/ALT/P/R hit...