I AM SUCH AN IDIOT!!!!!!!
(now that that's out of the way)
Never mind what I was trying to do at the time. It's not important. I forgot about the "Repair Permissions" option and tried to use the "Apply to all enclosed items" on my Hard Drive while it was set at "Read and Write" for all. And It was going for a while. I thought "man this is taking a long time" and so to save time I tried to cancel it. But there was no cancel button. So using the command alt escape I relaunched it... FFFFFFFFFFUUUUUUUUUUU. It was saying a billion different files went kaput. I thought "okay okay maybe I can still salvage this" and restarted the computer.
Now it won't boot.
I wouldn't be heartbroken if I lost all my files on that Hard Drive but I would certainly prefer not to. Any help would be immensely appreciated. One thing is for sure. I need this computer not to be dead. Please tell me it's not dead. Please oh please oh please.
Tell me it's not dead.