Unable to get to safe mode or anything else

[lace]

When I turn on the computer, it asks me for a system password. I try to type it in, but the keyboard won't type it in. I've tried another keyboard that I am certain works and it still won't type in the password. I can't get past the system password prompt. I've tried F8, F2, F9, F12...all keys take me to the same of asking me for the system password which won't type in. Any help is greatly appreciated with this one...

[Allan]

1) Have you tried a keyboard with a ps2 connection? if not...
2) Can you get into the bios? If so, see if there is a setting to enable usb on boot

[lace]

The tower doesn't have any ps2 ports only usb the old, old plug-in type (which I don't have any of those keyboards). And I am unable to get to BIOS as it asks me to type in a system password...I should also mention this computer did work not long ago...I had set a system and administrative password in the BIOS Setup. After I did that was when I got this failure...

[patio]

So none of these:         .    ? ? ?

[lace]

nope...none of those

[lace]

SOLVED: 

http://support.dell.com/support/edocs/dta/_trmntor/00000045.htm