Is it possible that the card is blowing the adapters somehow?
His monitor only has a D-Sub, and an HDMI connection, so using a standard DVI cable isn't an option.
Thanks in advance for any help.
Bloody unlikely. Those are pretty passive devices, I doubt they are ever fused.
Go to monoprice.com and get a dvi to hdmi cable. Set the HDTV to game or text mode if possible. Disable overscan if needed.