Visiting with my parents and trying to watch TV their Roku1 player (2710X). All of the menu screens work (Home screen, Amazon Prime. Netflix, Vudu, etc.). However, when it tries to play a movie, we get the soundtrack and a purple screen - no error message. Tried a system restart (didn't work) and system update (software up to date). Could it be the even though all the menu screens display properly? Is it the fact that its an older player? Thanks.
Try a different HDMI cable or a different input on the TV.
@pstelter Thanks for reaching out. As @renojim mentioned, changing the HDMI cable in use, or connecting the device to a different HDMI port are common ways to resolve this issue. You can see more troubleshooting information for this issue here: https://support.roku.com/article/208755468-what-should-i-do-if-i-see-a-hdcp-error-detected-message-o...
Keep us posted if you need more help from there.
Thanks,
Tanner
Using another hdmi input worked for me.
I've had this issue for years, and I came here looking for a more elegant solution, but here is what I do currently:
This fixes the issue for as long as the TV stays on, even if I change inputs to use another device and go back.
A different HDMI port/cable and power cycling hasn't worked in the past.