I got an unused Hifiberry Amp2 from ebay, and for a while it was working great, driving my speakers just fine.
And then I screwed with something (of course) and it's no longer seen by the OS. I have the dtoverlay=hifiberry-dacplus and removed the dtparam=audio=on. I've tested using the latest moodeaudio image as well as the latest hifiberry image, but neither show the board.
Is there anything else I can do to troubleshoot this, or do I have a burned board, and is there nothing I can do about it?
edit: forgot to mention I tried the hifiberry on a pi3b and a zero, and it wasn't seen on either.
edit2: using the same power supply as when the board was seen, and also not seeing the LED turn on, on the hifiberry. Both PIs get power through the hifiberry still.