Korg Poly800/EX800 Users

Just got the battery replaced on my Poly, and unfortunately it lost 
all of it memory in the process.  I never had to use the tape backups 
before, but now its pretty helpful to be able to do that.  
Unfortunately, I can't get my keyboard to respond to any kind of 
input.  I know that my cable is putting out signal (I hear the lovely 
model-like screetch through headphones and see the voltage on my 
multimeter) but I can't get a GOOD or ERR indication.  It just sits 
there and taunts me with the LOAD display.  Maybe I'm inexperience at 
this, or maybe I'm just dumb, could be both.  So I tried the reverse 
by programming a few sounds in by hand and then trying to save these 
to tape.  The display says SAVE but I get no output out of the jack.  
I can't see anything on my level meters or on multimeter measuring 
directly off of the out jack.  I have followed my manual and tried a 
dozen different cable configurations and patches with the same 
result.  Am I just this dumb?  Help!

Nate