When I start my computer I try to access the BIOS but the loading screen doesn't even come up. A few days ago while I was trying to overclock I may have turned UEFI secure boot off. I believe turning it back on would help but I would like to know how, when I cant even access the BIOS where I turned it off. When I first boot my computer the screen stays black and I cant seem to access anything like get into the BIOS. After the screen comes back on all I see is the login screen. It doesnt give me a chance to press the Delete key or the F12 key. Any Ideas.