Thank you for dropping by here in the Community. It would be my pleasure to help you with any questions you may have with restoring backups in QuickBooks Desktop.
Since you're unable to boot your existing hard drive, you can install QuickBooks in a different computer and use the backup copy stored on your portable device. In case you're unable to acquire the license and product information by pressing the F2 key on your existing QuickBooks, you can either use the License Look Up tool or through the CAMPS website.
For the detailed steps on downloading and installing QuickBooks Desktop, I'm adding the articles I recommend on this: