Yeah followed the instructions on the site. Held left button (one nearest the USB slot) down for a while (more than 5 secs for sure) with 8Gb FAT32 flash stick that had "colordmd.rom" file for the machine in the root directory plugged in.
Screen didn't change/ go dark/ do anything on either machine's display. Going to find another USB stick and try that.
Screen didn't change/ go dark/ do anything on either machine's display. Going to find another USB stick and try that.