Pretty sure it is a K4600. Found a label in the bottom of the cab that says 19K4616 and it has both of the cards pictured above. In fact, the brown one that I am to adjust was unplugged when I got it. I powered it on and got no video but could play blind. When I started looking at the monitor I saw that the brown card was wedged in a way that it didn't fall out but was completely unplugged. There is a plastic bar that is supposed to hold them in but I am having trouble getting it to "latch". After plugging it back in I got video but the other symptom I described. I am going to post a pic later when I work on it if only for posterity.
Thanks for the information guys!