[Question] MSI Z97 gaming 7 CSM bios setting not found.

I am running HS 10.13.3 with no issues on one monitor, however if I boot up with a second monitor plugged it both screen just stay black and I am not able to sign in.

I can connect the second monitor AFTER I've logged into the machine and it works fine.

I read that I'll need the CSM option enable but I am not able to find it on my bios. Anyone has any idea how I can do this?

Thanks,