Can't access CMOS/BIOS - BLACK

I can see the very first part of POST.  If I press pause/break, it tells me that DEL will take me to CMOS.  If it does, it is not displaying and I can't see it.
I thought perhaps it was my USB keyboard, but I've changed that out to a regular keyboard.  Then, I thought maybe it was my AGP graphics card, so I changed that out to an old Diamond S3.  
I know it's not my monitor backlight, since I can see the first part of POST.  I can also display fine from within Windows98 from a DOS prompt.
What I CAN'T do is:
Restart to DOS (screen is black)
Access CMOS information (screen is black)
Any other suggestions?  I need to be able to SEE my CMOS information and change something.
Everything works just fine in Windows.
KT3 Ultra-ARU(MS-6380E)  VIA K7
AMD Ahtlon 1400 something
Bios Date 7/10/2002 V5.5 AMI

Hjongste,
Thanks for the reply.  
In addition to the above-mentioned change-outs, the LED on the monitor stays green, just as it does when displaying the first part of POST, when I press DEL to access CMOS.  I believe it is probably GOING INTO cmos, I just can't see it.
Today I tried another monitor and still no go.
I also changed the resolution.  No go.
I at first thought it was the USB keyboard, or that the graphics card was windows only, but changing all these things out has proved that wrong.
The builder is a 5-hour trip by car for me, so I was trying to solve this myself.  I suspect either there is some weird setting in CMOS which I can't change since I can't see it, OR, that there is a chip on the motherboard that is bad.
I'll check back in on Monday night after my long drive and tell you what happened.  I've stumped people in 2 other tech forums, so we are all waiting with baited breath on this one!
Lolly

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