Unsupported Video Card Connection Error

[GLD3350]

Hi there,

I have a problem with my PC and was hoping you could help...
A while ago I set up a dual screen system on my computer, I had one screen plugged into the default slot and another into my video card (Radeon X600) using an adaptor.

Recently however, my computer had issued and I had to replace the Hard Drive. Since then, I have only been using one screen - the one plugged into the video card, the other doesn't work. This hasn't been a problem, except now I need to switch back to using the default slot.
If I try merely plugging the monitor into the default slot I get the following message on start-up:

"Unsupported Video Card Connection - This computer has an add-in graphics card, but the monitor is plugged into the integrated video connector. Yadadada".

I've tried changing the settings so that the computer forgets about the video card and uses the integrated video connector instead, through the Display Properties (right click on Desktop -> Properties -> Settings), but only optons for the graphics card appear.
What am I doing wrong? Can anyone help?
Thanks for reading.

 

[ski]

If you do not have to use the video card, then start in Safe mode, uninstall the video card's driver software from Add/Remove Programs, remove the video card from Device Manager, shut down the system(do not restart at the prompt), remove the video card from the MB, restart, go into BIOS and make sure the onboard video adapter is enabled, and restart normally.