I just purchased a new HP desktop computer. It is attached to a monitor whi h have had for four years but have misplaced the manual. I have been working with a business that needs to get on my computer so they can show me the lessons we are working on but this will not go through my monitor. They seem to think that it is not compatible with the card in this model. Would you please tell me how to get a manual, or better, the card for this model, I do not have this info either. Thanks.