USB keyboard doesn't work before Windows login (can't access BIOS)

Hi guys, I've been at this for three hours. I hope you can help and I'll get to the point:

- Need to access BIOS. USB keyboard (Logitech G110) not recognized until the Windows login screen loads.
- No PS/2 ports (and blast it, I have a PS/2 keyboard that I can't use). Cannot get a USB->PS/2 adapter at this time.
- I reset CMOS and disconnected the hard drive. This produced two lines saying there was no boot disk, did not drop me into the BIOS.
- HP Pavilion P6000, model P6220f.
- I have no other USB keyboards available.
- The keyboard doesn't light up until the login screen.

The way these threads seem to go elsewhere is: "Can't get to BIOS with USB keyboard." "Okay, change your BIOS settings to turn on legacy." "But I can't access the BIOS!!!"

I'm trying not to purchase additional computer crap. I accept that there may be no way to do this. Thanks if you can help.

Oh yeah, I tried all 6 USB ports (including the 2.0 ports in the back).

Layback Bear said:

Could you give us exactly what motherboard you have.
Most of those HP motherboards came with PS2.

Downloaded a program called CPU-Z which says:

Brand: American Megatrends
Version: 6.02
Manufacturer: FOXCONN
Model: 2AB1 DVT
Chipset: AMD 785G
Southbridge: AMD SB700
LPCIO: ITE IT8721
Date: 07/21/2010