My MacBook Pro (2009) crashed. Got the gray loading bar for two days. I was finally able to erase it so I can reinstall. But now there is no startup disk available for me to select to reinstall Mac OS X. I went to Disk Utilities, tried to erase (Failed: input/output error), partition(Failed: cannot allocate memory), verify disk(Cannot verify...repair disk), repair disk(Cannot repair disk...back up...reinstall), everything I could think of. Did the command+s and put it the /sbin...code. Nothing works! I've researched and researched and have tried everything I could find. Please help. I know it's overdue, but I really REALLY don't want to buy a new HD. I'm hoping it's just something stupid I missed.