I think it may be a hardware failure. I've had it plugged into the original pixel charger it came with for two days now and still nothing.
No normal boot loading screen, even with a hard restart, etc.
Just to try, I even took a head gun and warmed the whole device up quite a bit just to see if it would help some solder contacts or other connection points, as a last ditch effort. Still nothing.
We'll see what it does in a few days time, but I've already assumed this 5a is toast after only ~16 months of use.
