If these steps do not produce a solution, contact Intel's technical support group. Gathering Information Troubleshooting starts with diagnosis and progresses to a solution. Before diagnosis can begin, you'll need to collect some information. This is especially important if you don't already know the contents of the computer. See if the monitor cable is securely attached to the graphics board.
Loose cables are the most common cause of board problems.
If it is loose, secure it now and see if the graphics card functions with the computer. See if the graphics board is seated correctly in the AGP slot on the motherboard. If it is not seated correctly, remove the board with the computer power off and reseat it, making sure the entire board connector is flush inside of the slot. Find out what other boards are in the computer. Boards can conflict with one another, and resolution of these conflicts varies depending on what boards are present.