I have two Dell optiplex 7010 desktops that came with Windows 7 pre-loaded. The end user tried to reimage them with Ghost disks that were not formatted properly. Consequently the reimage process failed. The user then tried to use recovery disks, reinstallation disks and a reinstallation thumb drive but has been unsuccessful.
The boot sequence has been changed in bios to put either the cd/dvd drive or the USB drive first. Regardless, rebooting the computer still brings up the black "Error loading operating system" screen. He cannot go any further.
We've tried hitting F12 so that it prompts for where to boot, and even when selecting the optical or USB drive, it goes back to the same error.
Any advice on how to get past this?
Thanks for your help in advance.