Have you switched the video output to the slot your mad dog card is in.. Go into your system bios and change the video from VGA to which ever type of card you installed, like vga to PCIE or VGA to AGP !! Alternatively, if you see the AUTO option, enable it as the system will then route the video output to which ever video card is currently connected to a monitor. Just make sure you plug the monitor into the new card BEFORE you reboot the machine.. In other words, use the old video output to change the bios settings, then BEFORE you hit F10 to save and reboot, swap the video cable to the new cards output and then hit F10..
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I will need to know the Manufacturer and Model Number of the Motherboard as well as the Part Number of the new Video Card. If you can find the Wattage on the Power Supply that would help as well.
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