> ... i tried everything from midi reset, warm reset, cold reset
> (have no idea what they did really), then I switched on
> main local control switch, link local

If the keyboard hasn't come back to life on its own, then perhaps the best
thing to do would be to go through the full restart procedure.

Specifically, refer to the "What to Do If You Loose Your Memory" section of
the service manual
(http://www.rhodeschroma.com/content/polaris/servicemanual.pdf). This is
covered in chapter 6, and it summarizes all the steps to go through and
reset the memory, and to redo the necessary setup of the keyboard.

Once the keyboard is at least able to play its scratch patch again, you can
load up some patches. The factory patches and sequences are available here:

http://www.rhodeschroma.com/?id=polarispatches