Okay, this is weird. I don't know if my kids did something or what.
Suddenly, whenever windows goes into graphics mode, the screen goes
completely blank. Let me describe the scenarios......

I couldn't figure out why the display would go completely blank, so I
reloaded the OS (Windows XP). The graphical portion of the load works fine
as does the generic VGA mode. After the boot, I can see the 640X480X16 color
screen. After I download and load the latest ATI Radeon drives from the
Compaq web page, the system reboots. After the reboot, I see the text
portion of the boot, then I see the Windows XP logo with the little bar
below it that shows the progress of the OS load, then blank. It's completely
blank, like all power is being removed from the display, no back light, no
nothing. The PC is still operating. I can hear sounds, just no display.

So, I tried loading Windows 2000 Pro, same problem.

Then I loaded Windows ME, same problem.

I loaded a few versions of Linux and they all work! So I know that the
display is functional.

I tried toggeling the Function F4 sequence which changes display output to
the video-out connectors, but this had no effect.

Any ideas?

Thanks!