Korg Poly800/EX800 Users

My Poly800 mk2 was working fine (with some sudden turn-offs) but 
yesterday, it gone dead (or nearly dead). No sound, it turns on, the 
11 patch blinks on the display, but it doesn´t make any sound, or 
even let me change the patch, and it turns off before i can load the 
original patch... I think it might be the AC adaptor that fried 
something inside (i´ve been using an AC adaptor from a Korg 
Electribe, same voltage, it worked until now) or the internal 
battery...The Poly seemed very "temperamental" since i´ve done a sort 
of "Moog Slayer" mod... Now it seems dead...