If your keyboard is USB , and you have this problem then your BIOS does not support USB keyboard, or USB Keyboard support option is turned off in BIOS.
Solution : Try to get some old PS/2 keyboard and then try to enter in bios and turn USB keyboard support ON. If your bios doesnt have this option then try to find USB to PS/2 converter and use it when you need to set up something in bios. Hope this works !! (IMG:
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