The hard drive doesn't even show up on the Boot Sequence. I tried adding the hard drive as a boot option but it says that it does not exist. I also checked and the computer is set to UEFI mode. It loads and runs Ubuntu just fine from the thumb drive, but it won't boot the installed version of Ubuntu. I even double loaded to images of it side by side as someone else suggested. Still won't work. I used Gparted to flag the main Ubuntu partition as the boot as well and that did nothing. Help! I need this computer back!