Stuck on alert (and hdmi issues)

[Delibirb77]

Reflashing the SD card is exactly the same process as when you first set it up, and this will fix this issue.

As for what you can try before pressing the reset button in the future:

When should the reset button be used?

What does the reset button do? The reset button is hardwired to cut all power to the system instantly and does not allow muOS to safely close anything currently running. This is like pulling the plug from your PC while it is still running, and is likely to cause corruption of important files. This may not become apparent until much later when your device starts exhibiting weird behaviours. Because of this, it should only ever be used as a last resort. What should I do instead to minimise corru…