I have a Cerbo GX running firmware v3.40~29. I have connected a touch 50 to the Cerbo, both HDMI and USB and no display. I have also connected a 15 inch monitor with a HDMI input to the HDMI output on the Cerbo. Each time after connecting a display to the Cerbo I rebooted the Cerbo GX and waited for half and hour to see if anything appeared on the screen. I've checked the voltage on the USB port next to the HDMI port and that seems to be fine.
Any suggestions?