This is my first post so I hope I'm using the correct forum. I downloaded Mavericks yesterday (because it was free) and then later regretted it when my older MacBook Pro wasn't running well. I read that I needed to erase my hard drive and re-install Mountain Lion-which is what I want to do. I have an external hard drive but it isn't showing up on the OS X Utilities---> Restore from Time Machine Backup While in Disk Utility, I erased "Macintosh HD" and now my start up icon is missing and I am stuck in Disk Utility. (I can't pull up the specs on my computer, sorry) Should I have erased the other option "200.05 GB Hitachi HTS7) instead? When I click "restore" I see a page with Source and Destination. Will this help me? I hope this made some sense. Thanks for helping a frustrated newbie.