New toy, HP Apollo 4500, and it's broken...

I got a apollo 4500. It has a 68030 inside, and a 700-someodd meg MFM (?) harddisk. I have no idea what it runs. This one has a SummaSketch pad with it. It was used for CAD stuff. What's it run? The problem with it is, the video card appears to have died. WHen I power the machine on (It has a VERY LARGE [21"] RGB monitor. Any chance of me connecting it to a PC? It has 3 plugs, R G B, and expects sync on green) and the monitor, I get garbage. The garbage is the same almost every time. There is 3 patterns. The first one is just garbage, the second one is the same garbage only dimmer, and the third is a light blue blank screen. All of them are light blue colored. The summasketch puck is also wrecked, someone's jerked the MMJ plug off the end. But I can get another one of those. There is a switch in the back (Next to the reset (?) button) than, when pressed, activates a 4-LED indication inside the case. When I start the machine, it flickers around, and stops at 1 on, 2 3 and 4 blinking. Is this a failure code? What's this switch for? Am I correct in my assumption? (Dead video) I've already pushed all the socketed chips in as far as they'll go. That didn't help. I also removed the video card (It has no socketed chips) and reseated it. This also has a network adapter, labled DOMAIN RING. What wire does that expect? I'm guessing it's not Ethernet... Oh, the label on the front says APOLLO DOMAIN 4500. FOrgot that :) -------