Our quandary in trying to help you with this is that you have no troubleshooting experience with electronic circuits and we'd be asking you to take voltage measurements at different points to try to determine the problem.
It may not work here, but my next suggestion would be to Google the make and model number of your recliner in an attempt to find someone in your area who might service your model. A long-shot I guess, but that's the first thing I would try. If you can't find someone who services your recliner near you, your Google search might turn-up a drawing (called a 'schematic') for the circuitry in your recliner, which would go a long way in helping anybody else near you who knows about electronic troubleshooting, to have a 'road-map' of the electronic circuitry in your recliner, and maybe get them enough information to troubleshoot your problem.
If none of the above sounds very helpful, do you know of anybody personally with handy-man type experience on electrical items, that might be able to take a look at it and see what he thinks?
You might have some pinched wires if the chair was moved around while not in use for those six months. I'd look to see if you see any obvious damage to the wiring, or the wiring connectors.
In it's present unknown condition, I caution you to leave the electronics unplugged from power when not in use, until somebody can check into the problem.