MSI Z87 MPOWER - Manual (Page 49)

Chapter 1
1-35 Getting Started
FASTB1: GO2BIOS Button
If you enable the "MSI Fast Boot" feature in BIOS, the keyboard will be disabled during
POST and entering BIOS Setup by pressing "DEL" key will not function. Once you
press this button, the system will enter BIOS setup directly at next boot.