I picked up a UKM3 with graphic errors and was hoping someone could point me in the right direction on where to start probing with the logic prob. The board boots and from what I can tell passes the rom check. It has graphic glitches and to me it looks like the colors are inverted (black is white). On the test menu checking red shows black screen, and blue and green color test show grey screen. I have not checked the rom chips because of the issues on boot up. Any help would be appreciated.

