Korg Poly800/EX800 Users

I just came across a Poly-800 and am trying to get it operational. 

My problem is whenver I turn it on, the display doesn't do anything. 
Nothing seems to happen except for when headphones are plugged in the 
phones output, it makes a lot of noise. Almost like white noise but not 
quite the same thing.I've seen one other case like this on the boards 
but they just were told to reload the patches. I tried this, and it was 
my first time and I was in a rush so I may not have done it properly. 

I took it open and got a brief look at the circuits and everything 
looked good with a quick glance.

Any ideas at all though? I really would like to get this up and 
operational if at all possible... Thanks to everyone for the help...