I suggest you go to the Compaq site and see if there is a flash bios update. I had to do that for my Compaq 5000 series Presario in order to disable the onboard card so I could use another card.
I might suggest you try removing your ATI card from the AGP slot in your computer after first deleting any entry in your device manager that refers to the card. Then start your system once with no card installed. You can use safe mode if you like so it simply uses VGA 16 colors. Then shut off...
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