I can't get into the BIOS.

I'm hitting the Del key during the boot process but I get a 'No keyboard detected' message. That message is correct: none of the keys are detected. My Memtest86+ v1.70 CD in my DVD drive and it loads after the above message. The funny thing is the keyboard works while Memtest86+ is running.
Am I going to have to clear the CMOS? Any ideas?
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