First, make sure you BACKUP ALL your data before proceeding. This will wipe your HD clean and your data will be ERASED !
You’ll need to restart your computer.
- Press and Hold alt (option) key.
- Select Recovery option.
- Select Disk Utility.
- Select UberMac, in your case should be Macintosh HD. Click Erase. Under Name: Macintosh HD Under Format: OS X Extended Journaled. Proceed with Erase.
- Once the HD is erased, go back to main page and select Reinstall OS X.
- Reinstall OS X –> Continue –> Agree to Apple Terms & Agreement –> Select Macintosh HD –> Install.
You are all set ! After the installation is completed, the computer will restart and bring you to setup account wizard. Follow the steps and there you have it. A brand new OS Installation !