I installed a pwoercolor red devilrx 580 into a dell vostro 270(shares same mobo as inspiron 660) no OS installed yet, I triedbooting into bios with hdmi plugged into the rx580 it gave me no dignal screen on monitor so i pluggedinto motherboard and it worked i then changed to legacy mode and disabled secure boot and enabled legacy oprom and then it worked when plugged into gpu, but uefi and secure boot are more recent and better so im wonderng what issue is thats making it unable for gpu to display when in uefi and secure boot please help.🙏🙏 psu is changed to a 650w and cpu is i7 3770.