So today I bought lion off of the app store and after it downloaded I began the installation all looking good till now. It starts installing and a few minutes into the installation it says that my hard drive is damaged and needs to be repaired and it asked if it should try restarting the system and installing lion again. I repeated this process like 5 times until I decided to try repairing my hard drive using the disk utility. After trying to repair multiple times and getting an error message everytime telling me that my hard drive is damaged I tried restoring it from the backups saved on my external hard drive but that didn't work either because when time machine tried to find the hard drive on my mac it wasn't detecting it. After all that I just tried reinstalling OSX Snow Leopard but then I got the same error as the one I got when I tried installing Lion "Hard Drive needs to be repaired..."
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Help