1.Examine the GTX 280 graphics card and remove any protective plastic from the card. Typically, this is located on the interface connectors.
2.Power down your computer, turn the power supply off and remove the power cord from the back of the computer.
3.Open your case. The exact method for opening your case depends on the type of case. Generally, you'll either slide out a side panel or unscrew the top panel to gain access to the computer.
4.Disconnect the monitor from the video card by unscrewing both sides and pulling the connector gently.
5.Remove the power connector on the current video card. Unscrew then pull the current video card out of the case and set it aside.
6.Slide the GTX 280 into the PCI-E slot on the motherboard...