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video card upgrade

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I have an older Dell Optiplex 755 with Intel Core 2 Quad, CPU Q9550 @ 2.83 GHz. I have tried to upgrade the video card with a Radeon HD6670 video card. the system doesn't recognize the video card. The fan on the card turns so I know it has power. What have I done wrong?? Please help!!!

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:welcome:   hd4tim


Can you please confirm that I have the correct model of computer here


If it is the correct one tell us which of the following case types it is that you have;


Mini Tower Computer (MT) View 5
Desktop Computer (DT) View 6
Small Form Factor Computer (SFF) View 7
Ultra Small Form Factor Computer (USFF) View

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