I have an Acer monitor 1715smd that when plugged into an IBM ThinkCentre desktop computer will turn on, LED light turns green, screen flashes Acer name. After this, the screen goes black, LED light turns orange, and the word no signal, flashes across the screen. I have tried a different monitor, cable and the same issue occurs. Am I right to assume either the video card is the issue or the port has been severed from the motherboard? Is there another possible issue and or fix?