I'm sure it's the battery. I was given a Chroma Polaris 20 years ago -well, actually in trade for some sound design work, but got a great deal because it wasn't putting out any sound at all. But when I replaced the battery -bingo! I actually did reload the factory sounds, but since then I'm sure all the voices are custom. The thing is just too easy to program... but it is nice to start from the factory for ideas.
Be real careful opening it up -that is where most of the failures come from because an internal connection ribbon can crack when it flexes after so many years. I've got to open mine up again soon -this time I'm going to make access for changing the battery from the outside via an opening in one of the wood side panels.
Good luck.

------------------------------------------
When I unpacked it recently it did not sound.
...The front panel appears to work fine.
I was wondering what suggestions any one has for rebooting the instrument. I will probably replace the battery at the same time.Thanks in advance
Best regards
Thomas Rizzi
rizzitech@...