|If you are using a USB keyboard you MUST make sure it is a Wired keyboard plugged into a USB port that is active at boot up. On a desktop these are Rear USB ports directly on the motherboard. If it is an early adapter of USB3, use a USB3 port since the USB ports are powered through a third party chip (not through the chipset) and require drivers to be loaded after boot up. Ports that are on hubs, internal hubs, onboard USB expansion cards, and some front UPS ports are not active at boot up. Of course, if you have an old PS2 keyboard and the machine has a port for it, that is a good one also. Laptops are more limited but bypass any hubs and try different USB ports (USB keyboards) if the onboard keyboard is not working for you.|
You have to be a little bit crazy to keep you from going insane.