Compaq C500 Arrives with bad video.
The information is displayed just not properly. External LCD also displays same thing. This is related to the video memory of the unit and not the GPU in this case.
This will require a low temp reflow. Because video memory is often not glued to the mother board, low heat has to be used so that the chips become separated from the motherboard. If that happens it will require special equipment and higher cost to the customer.
If you unit does not have dedicated memory for video, then it would be the chip that addresses (provides the row and column information for the GPU) the video memory. This is usually a large chip directly to the side or near the GPU. Typically on Intel models rather than AMD.
Middle picture shown after reflow.
Link Video showing screen issue at Youtube
if you have issues displaying from blog.