Motherboard problem

Hi all. I seem to have a problem with my motherboard, I think. Basically here's what happens. When the computer starts up, I can see the message that says press del to enter BIOS, the problem is that my keyboard doesn't seem to work. I have tried different keyboards, both ps/2 and usb. I have also tried to troubleshoot the motherboard with minimal setup and even start it up without it being connected to the case. Nothing seems to have worked. I even went back to the store and exchanged it for the same kind, but it still won't won't let me enter anything with a keyboard. Any help would be greatly appreciated.
Here are my specs:
Motherboard: Mach speed PM800BMS
http://www.newegg.com/Product/Product.asp?Item=N82E16813187007

cpu: pentium 4 630 LGA775
case: Ultra UV Wizard

Make sure you don't have any bent pins on the keyboard's PS/2 connector. Secondly, make sure you're connecting it to the purple PS/2 port.

Big B said:

Make sure you don't have any bent pins on the keyboard's PS/2 connector. Secondly, make sure you're connecting it to the purple PS/2 port.

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Thanks for the quick reply. I checked the pins on my keyboard, and they are fine. I have another computer, and the keyboard works fine on that other one. I just don't know what to do. Maybe I should just attempt to return this motherboard and get another brand?