Dell Optiplex 760 Bios Trouble Help

Alright so the past few days I've been trying to access the bios on my Optiplex 760 to get my Core 2 Duo e8400 to 4ghz. But everytime i try to press F2, it takes me to that white screen. Why is that?

Видео Dell Optiplex 760 Bios Trouble Help канала TheOpticTomahawk