How much would it cost (approximately) to get my AIO HDMI input port repaired?

The HDMI input port on my all in one PC seems to have stopped working.  I plug an HDMI cable into it, but get no reception.  I know it's not the cable because it works on my TV.

If I were to have it repaired or replaced, about how much should I expect to pay?

What kind of computer is it? Without knowing the pc there are a couple of possible outcomes:

1. The motherboard will have to be replaced. Could be anywhere from $200 or more(or less) depending on how readily available the part is. 

2. The PC uses modular parts and the graphics card needs to be replaced. Depending on what kind of card it could be as little as $50 or more.

3. Its a driver issue and they charge you whatever the cost of their labor is. 

Thats what I thought but this could differ based on exactly what kind of AIO it is.