nope not a problem with the power supply. just an issue with the bios of the MB. older MBs worked like that. you could try updating the firmware of the motherboard. you can also check if there are any usb keyboard specific settings in the bios as well.
ahmm gud evening to you my friend, i updated my BIOS like what you said, I used the ASUS AI Suite to update my BIOS while in OS, and i was successfully updated, and my USB Keyboard now functions well...
THANK YOU SO MUCH