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I have 2 computers on which i have ATI Radeon HD 5970 graphics card installed. There is 1 VGA out and 1 DVI out in it.

When I connect my VGA out to a monitor on my 1st computer, it shows it as display 1 and when I connect my DVI out to a monitor it show it as display 2 (I am using extended display). When I do the same thing on my 2nd computer it shows just the opposite. The VGA out shows as display 2 and the DVI out shows as display 1.

Is it a problem with the drivers or the hardware? (because the graphics card on both is exactly the same)

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Welcome to SuperUser. I've edited your post, if you are unhappy with the changes feel free to revert or edit it again. –  Baarn Sep 1 '12 at 8:24
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1 Answer

It's not a driver issue at all since your extended desktop is working and working well simultaneously.

Here's the solution:

  • Right click on your desktop, go to Screen Resolution.

  • Drag your Display two on the left side of one in the Change the Appearance of your displays.

  • Click on Display 2 , the one you dragged to the Left of Display 1.

  • You will see a CheckBox on that page, Make this my main display.

  • I am attaching a screenshot of the same. Hoping it will solve your problem.

  • Other than that, it doesn't matter which is 1 or 2, it's just how windows detects it during installation. If you disconnect both, connect the one you want as 1 and boot your computer, it will be tagged as 1, then connect the other one, and it will be tagged as 2. So it doesn't matter.

Making display 2 a main display

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