Reseat the video card. Check if the VGA connector is properly connected. Also check if there is power to the monitor. When the computer is completely disconnected from AC outlet, try discharging the BIOS by either removing the battery or moving the jumper. If you move the the jumper, move it back to its original position after 10 to 30 seconds. If you have remove the battery, put it back in after 10 to 30 seconds. Then power the computer on.
If Athlons are not properly heatsinked, they will get damage. Use either tape that came with the heatsink or silver heatsink grease. Never use both.
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