What size/model number of monitor?
Also, what's an HD5950?
I was just going to mention this as well, I'm thinking it's possibly a 6950 or 5970, one of the two.
EDIT: From the pictures it looks like it might be a 5850.
I'm not sure whether it's a 5950 or 5970, so to play it safe I opted to sell it as the lesser model.