Korg Poly800/EX800 Users

Hi, I wonder if anyone else has had this problem: I turned on my poly
800 (v.1) the other day and it had just sort of crashed. It seems to
make no sound at all at first but if I keep the keys depressed a very
slow attack comes in followed by a horrible sound. Going through the
editing menus I get a lot of garbage type readouts. Is this the end
for this particular keyboard?
Thanks in advance,
Alan