The 10.1" DVD player only seems to recognize the HDMI signal if it's powered on before the Pi3 boots up, however both devices are always powered on at the same time in this setup.
Is the only way to resolve this issue powering on the screen before powering on the Pi3?
I have checked config.txt to make sure HDMI hotplug is enabled:
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# Force HDMI even if unplugged or powered off # hdmi_force_hotplug=1