I have a Macbook Pro (late 2008) that was running Lion. I want to sell my Macbook Pro, but I did not have the bootable CDs. So, I proceeded to manually back-up and delete all of my files. I followed the instructions on apple.com to change the account name to the name of the new user. http://support.apple.com/kb/HT1428 Unfortunately, when I deleted the original user account via the Users & Groups pane (as explained on apple.com), it did not work as expected. It only deleted my original account in the Users & Groups pane, but the files were all still in Macintosh HD> Users. I then drug my original account folder (from Mac HD> Users) to the Trash so the new user would not have access to any of my data. When I clicked on System Preferences> Users & Groups, it came up with an error message that said it could not access Users & Groups. I put my original user file back in Users, but this did not solve the problem. I then decided to restart the computer since that often seems to clear up any glitches. At this point, when the computer attempted to restart, it stayed on the gray screen with the spinning circle and Apple logo. I have read a ton of forums online, but have not had any success with their recommendations yet. As a last resort, I purchased and downloaded Lion and made a bootable DVD. However, my Macbook is not recognizing anything besides the HD. I have tried a DVD, thumb drive, and external hard drive and none of them appear when I boot while pressing the option key. I would really appreciate any suggestions on how to fix my Macbook or recommendations on what might be wrong. Thank you SO much!