ThinkJet 2225BK error light flashes twice on power on

[institches]

Hi,

I recently picked up a 2225BK ThinkJet and when I charged the battery and turned it on, it seemed to do as it should so imported some new old stock ink cartridges.
It worked fine for several days when connected to my 75C, 71B and 41C. After setting it aside for a couple of weeks, it is no longer working.

Symptoms:
If I load paper and turn it on, the amber light flashes twice. There is no power light.
If I turn it on without paper inserted, I get continuous amber light on until I load paper and then it flashes continuously. Still no power light. No action whatsoever.
The manual suggests taking it in for service. Not an option
I also tried holding the LF button while turning on for self test (which worked originally) but nothing and the amber light flashes twice when button released.

Things I've checked:
The ribbon cable looks in good condition. I cleaned the terminal surfaces.
I removed ever capacitor and checked it with an ESR meter out of circuit. All seemed within spec but I replaced two anyway.
Visual check shows nothing.

Any ideas would be appreciated.
Cheers, Gary.