Can't enter bios with F2 or DEL

Mike_286

Commendable
Nov 14, 2016
5
0
1,510
I have a ASUS Z170 motherboard.
The error I am getting is that it is not detecting a CPU fan because I don't have 1 plugged in. I have a heat sync with a separate fan attached and it shuts down my computer after 15 seconds. I know this is a setting I need to changed in my Bios but I can't get into my bios. It was press F2 or DEL to enter settings but nothing will let me in. Any ideas?