Raspberry Pi not finding AMP2 sound device

I have a hifiberry AMP2 on a Raspberry PI 3B+.

It appears that it's not picking up the AMP2 as a sound card at all.

$ aplay -l
aplay: device_list:272: no soundcards found...

$ cat /etc/debian_version

$ uname -r

$ tail /boot/config.txt
# dtparam=audio=on

$ cat /etc/debian_version

$ uname -r

Running dmesg shows nothing about the hifiberry at all. ie

$ dmesg | grep hifi

It's connected to a 12V/6A power supply.

I suspect it may be a hardware issue, but I don't have another raspberry pi to test things out. I have some questions:

1. Is there anything else I can do to try do debug? I'm at a loss.
2. Does the AMP2 itself have an indicator light of any kind? I'd expect to see one, but there's nothing is lighting up. Is this indicative of anything?

Attached a photo in case it's helpful

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