Computer Can’t Enter BIOS? | How to Force It
If the motherboard or the CPU’s power connector is plugged in wrong or faulty, you won’t be able to boot to BIOS. The motherboard has a 24-pin connector, so make sure it’s plugged tightly in the right place, and there are no signs of damage on the cable itself. The CPU usually has an eight-pin connector in a 4+4 shape.