OBERHEIM SYNTH

I just recieved my matrix 6r and to my dismay when I plugged it in I got @@@@@@@@@@@@ 
across the entire LCD screen and none of the buttons worked, I tried turning it on and off 
again a couple times and nothing but the same @@@@@@@@@@@ all the way across the 
screen.  I then tried hooking it up to my midi controller to see if I could get any sound and 
nothing.  I ran through every midi channel and nothing worked.  I then looked a little closer 
and noticed a few screws missing on the case so I went ahead and removed the top, when I 
noticed that a cable that looks alot like a standard IDE cable(with 3 connection points) was 
disconntected.  I proceeded to plug it back in but it didn't help at all.  I also checked to see if 
all cable harnesses and chips were seated properly, which they seemed to be.

Has anybody here ever checked out thier M6 or 6r(is that really an IDE cable....wish I had a 
picture of the insides of this thing)....and has anybody ever experienced this problem? Maybe 
know how to correct it.   I'm guessing the Rom chip may be messed up...but that is just a 
guess.

Brian