I had similar issues, but with a DVI input on a monitor.
For me at least the rainbow screen was showing sometimes, but often also not.
After tons of different settings in config.txt (which didn’t solve the issue) and different hdmi-dvi cables, I ended up reinstalling Raspbian. After that I got the screen working again.
The only thing is that there is no red color on my monitor. Tried different power supplies, cables and certain settings in config.txt, none of them fixed my red color missing issue.
But that is another story…

Give it a shut to reinstall. Don’ t forget to save data as reinstall is wiping the sd card.

@icripps for hotword there is a set of instructions in it’s readme about working thru this kind of problem.

Will work for amk2 as well.

When you turned it off before, how did you power down the pi? Did you use the inline power button in the power cable? If so, it’s possible that the card might have been corrupted. If you have a known good backup, I would try flashing that back to the card to see if it boots. I don’t know why the power supply includes a push button switch, as this is a known way to mess things up. It’s best to SSH in and use the command sudo shutdown instead, or wire up a momentary switch to the GPIO that runs a script to execute that command.

However the fact that you say that not even the red light comes on leads me to believe there is a larger problem, and the board might indeed be dead. If you have a spare SD card lying around, try flashing NOOBS on it and see if that boots.

hey, maybe it’s possible by replacing the common mirror of infinity mirror by two-way mirror and put your monitor behind ? i don’t know but maybe the infinite effect would be less strong .

(sorry if my English is not very good i’m french)

@icripps api definition says data can be returned in json format… and you might be able to use the MMM-Chart module

https://github.com/Snille/MMM-Chart

@rabbit83ka How do you cut the power to the backlight only?