I have a very similar motherboard. The reason it won't let you into the bios, is because the keyboard you're using isn't being powered. A lot of wireless USB keyboards, and a few wired USB keyboards have that problem. If you're using a wireless, try a wired. If you're already using a wired, try a PS/2 keyboard.
Wow, sorry mate. Maybe look through the motherboard manual to see if there are any jumpers to switch around? I can't really think of much else to do. I was having the same problem, but using a wired keyboard fixed it for me.