Genesis

The problem with solid is that if its microprocessor controlled there's no way to know if the controller is running or hung.

The first rule of displays is to make sure they don't display trash, especially in an application like this.

So if I was inclined to do something that was solid on I'd have it pulse "once in a while" (say, a short off for 1/4 second every 5 seconds) as a "health" indicator.

This way you have a crack at noticing if it stops running!