I'm using an RPI 3B+ and it suddenly stopped working (after shutdown didn't boot again). The SD-Led on the board shows constant green. I tried creating a new image-file on the SD (which until now has always worked fine), but didn't help.
The green light doesn't show up with the new SD card at all. Both SD cards work (checked them), as also the power plug (I measured it with a Voltmeter).
Any ideas why this happened so unexpectedly?