Two separate units seem to be dead

First off - I understand full or even limited support is EOL for 4K and 4K+ just hoping someone may have a direction for me.

My original 4K lost connection last week and now is not detected on 2 separate TVs. No picture, no light for power and I can’t see it on my network.
The exact same thing has happened to my 2nd box, a 4k+.

Tried multiple HDMI and power cables on 2 different TVs, multiple HDMI ports as well. So bizarre.
Don’t think it was a power surge because the 4k+ was at my parent’s place.

Appreciate any thoughts on any possible next steps.

What you mean by this? Please, specify voltage and ampere power or place pictures of the PSU labels, here.

The official OSMC power adapters - i just swapped the 4K and 4K+ between them

Can you upload a picture of the PSUs you are trying to use?

Have you tried powering from USB?