Motherboard won't detect keyboard

[Buk]

I have an Asus P55TVP4 mobo that detects cpu and mem but won't detect a keyboard. I've tried four different keyboards but no luck. Anyone got any suggestions about what to try next?

Thanks!

PS: Mobo is one I just got in a trade; only cpu, memory, keyboard, and vid card installed. Had a HD attached to PS for load, too. Was checking it out before installing it in a case.

 

[obeseotron]

This probably isn't your issue, but my motherboard doesn't like to use PS/2 keyboards. I have an all USB system now.