I apologize in advance for asking a question that I am sure has been asked before. The search engine seems to be down. I have a 2008 Macbook Pro (first generation aluminum unibody) running Lion. It has worked well for the past 4 years but in the past year or so, I have noticed it slowing down and going to sleep randomly if not plugged in, regardless of the amount of charge left in the battery. The other day, I took my chances and unplugged it from the adaptor and carried it over to my friend. After setting the computer down, the screen went black and I assumed it went to sleep b/c of the lack of external power. It would not respond to the usual open/close screen and I held down the power button. When I turned it on, it turned on but had a screen with four options: disk utility, look up the problem in safari, back up, or reinstall the OS. I went through disk utility and the internal hard drive was not mounted and would not mount. When I selected "repair disk," it said that it was corrupt and that I should restore it from a backup. I have no backups (I know, I know). Is there any way for me to pull data from my computer if the internal hard drive refuses to mount and it says that it is corrupt (would putting the computer in target disk mode work?)? Is this a physical hard drive problem in which I am screwed? What options do I have? Thank you all in advance.