Pico Display Pack not working

Hello. I have not been able to get the display working on the Pico Display Pack. I have run the example code which runs with no errors. I added in some print statements in which confirmed the code is running and the button presses are detected. The backlight seems to go out as soon as the code is run first time. Any ideas?

Ah - buttons.py does not display anything but the demo.py shows the balls - so it must be working.

I found with mine, that I need to power cycle /reset it before running a second or third py file from Thonny.
demo.py ran fine, but the buttons.py wouldn’t work right after that until I reset it.
Then it ran fine. I’ll be buying one of those Captain Resetti reset buttons for sure.
Captain Resetti (Pico Reset Button) – Pimoroni