I'm not sure if this applies to the 7500 and not sure what version of drivers you're using but I've never seen a Radeon than will enable the DVI output if it doesn't see a DDC prom on the display end. If it doesn't see a DDC prom, then it thinks no display is connected and you can't enable it.
I have been able to hot plug spoof it by connecting to a display with DDC, enabling the output then hot plugging to the display device without DDC.
I see the window with the small and large monitor icons (labeled 1 and 2).
That's a good sign!
Mon1 is VGA and Mon2 is DVI (or vice versa).
Now, next step:
Do you see underneath the window a pull down box, labeled as "Display"? It should say something like "1. Plug and Play Monitor...."
Also under that slider for screen resolution, do you see 2 check-boxes for "Use this device as primary monitor" and "Extend my Window desktop onto this monitor"?
You can toggle between those 2 monitors by either clicking on them in the window or selecting from this Display pull down box. For starters you want to have this "Extend my Win..." checked for BOTH monitors.... Confirm with "Apply". This should fire up both displays....
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