7i77 not detecting all of a sudden

Here's the log.
I've brought the PC and cards home so I can trouble shoot the setup without running back to the warehouse.
I forgot to bring the TB2 connector though so there's no field power applied at the moment. Just to reiterate though this setup was working without field power connected up until the other day. When I did the initial config I didn't setup any IO, limits or anything. Just FYI.

I'll get the plug when I'm out later in the day and connect a 24v supply.
I've also got a 5v supply here so I can test the 7i77 with a dedicated supply.

Just, setup the 7i77 up for external 5v, powers up just fine but no change in behaviour. CR1, 6 & 7 lit (still no field power applied)
Readhmd output is identical.

For external 5V power do you have:

7I77 W5 RIGHT
7I77 W4 and W12 LEFT
5I25 W2 DOWN
?

Yes, all as above.

Sorry, I should have stated that to speed things up.

Where are you located?sounds like both the 7I77 and 5I25 should returned for evaluation

Since you lost both serial interfaces at the same time it does sound like a 5I25 problem.
If you happen to have the right cable, a quick test would be to try the other 5I25 port (P2)

Mmm, I was afraid that might be the case. In Australia unfortunately so it's not going to be a quick turn around. Cant be helped though.

It's not great effort to make a DB25/dsub adapter or complete cable. I'll grab some 25pin ribbon cable and a few punch plugs when I'm out.