If previously using an integrated video device on the computer:
- connect the monitor cable back to the port that you used to connect to.
- If necessary:
- Boot up into the motherboard's BIOS settings, consulting your motherboard's documentation to disable the integrated video card
- Save the settings
- reboot with the monitor cable connected to your new video card.
- Should that not work, try swapping out your system RAM and running each stick one slot at a time and one stick at a time.
Make sure that the power supply meets the minimum requirements of the video card.
More important than the wattage will be how many Amps are available on the 12v power rail of the power supply.
You can check this on the power supply unit itself by removing the side of the case. The label on the power supply will list the 3v, 5v, and 12v power rails.
- Add up the number of Amps listed next to any 12v rails listed
- make sure that the total is greater than or equal to the minimum required listed on the side of your product box.
If your PSU capacity seems adequate, you may want to check for voltage fluctuations. Please see our FAQ here for further instructions