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It powers on, no video on screen, after a few seconds this plays. we have re-seated the socketed chips on the board and cleaned it. any thoughts? Video on : https://www.reddit.com/r/atari8bit/comments/fk0kkx/need_help_atari_800xl_error_code_black_screen/

Hello all, I recently bought a TRS-80 coco 2 (26-3026) with the 64k upgrade. The system powers on and runs both basic and games easily. If I run a color test program, in basic, all the colors show up correctly, However in games (Demon attack, Canyon Climber, Dungeons of Daggorath) all the reds...