Can't access the bios

Dec 26, 2018
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System specs i7 2600k, 32gb's of ram ddr3 1.600mhz 1070 ti SLI

I can't access bios, the screen goes black and then goes to windows after a few seconds. The main card was my CPU when booting up, I just get a black screen on start up until I get to windows, all cards work no problem.

I haven't changed anything in the last year or so, drivers are up to date and all that, i've reseated all components on start up and nothing. I want to reinstall my OS, but i'm worried I won't be able to see it when the computer restarts.