I've created a USB key for my windows 8 laptop, but when I boot from it, I receive a Red box that says something to the effect of 'Invalid boot signature detected'.
In my Bios, my boot options are UEFI, Legacy, and UEFI with CSM. It has always been set to UEFI.
What would happen if I were to select UEFI with CSM? Would this affect my existing installation on the laptop? I'm just trying to verify that I can restore the laptop from the server backup.
If it matter, as mentioned the laptop is Windows 8, UEFI and GPT.