[~rf~]

Any help would be much appreciated. Even if it is confirmation of power supply failure.
Today I had the same situation happen on not one but 2 888 i/o interfaces. I don't use this old digi rig much anymore. when I powered on the 1st 888 it lit up briefly, went dark and then began to pulse like a metronome thru the outputs. I then powered the second and it seemed to be fine, so to use the system I disconnected the master slave cable and the 1st 888 cable and repowered the 2nd 888. It failed within seconds. These units worked fine just several months ago.

I have good power and these units are mostly disconnected from a/c when not in use to avoid potential damage from spikes or strikes.