Dell Dimension E310 with USB keyboard - Cannot Access BIOS

Having a problem accessing the BIOS.   Another Dell techie suggested I clear the CMOS to reset the BIOS to default.  I did so, but unfortunately this E310 has no PS2 port for the keyboard, and the USB keyboard fails to allow me to hit F2 to access the Setup to fix the time-of-day.  Apparently the only thing the keyboard can do is ctl/alt/del which just brings me to the same problem - Strike the F1 key to continue, F2 to run the setup utility.  Those keys do nothing at all.

Also unfortunately, I'd accidentally disabled the CD/DVD driver, so I can't boot from a CD.  Actually enabling the driver was what the Dell guy was trying to accomplish when he had me clear the CMOS.  It might've worked, but I'll never know unless I can get past this F1, F2 screen.