Very odd issue, after I switched a 7010 to UEFI and secure boot, it no longer will display anything over the graphics card in it, but the onboard graphics work fine. I don't even get the Dell logo on startup with the graphics card, it's that bad.
Any ideas on why this would happen? BIOS is A29, the graphics card has been in that system (but under legacy boot) for years, and worked fine up until the switch to UEFI/secure boot and reimaging.