The easiest and quickest fix for this, and heaps of other motherboard problems, is to reset the BIOS. Some motherboards have BIOS reset buttons on the rear I/O panel, or on the motherboard itself.
Not all computer troubleshooting can be handled within ... CMOS (Complementary Metal-Oxide-Semiconductor), a chip on your motherboard powered by a small battery. The CMOS governs things like ...