emulatorII-list

hello.  I bought a used emulator II+ from ebay. The seller represented 
that it worked fine but that the disc drives didn't work.  It arrived 
today.  After turning it on, the lights all flash, and then the only 
thing on is the LED display which reads "emulator II boot in process" 
and then just stays displaying that.  No sounds come out.  Any idea 
what the problem could be?  Is this something fixable?  I will take it 
to my vintage synth shop to check it out.  As an aside, they had 
another customer some time back who brought in an emulator II for 
repairs.  It turned out that it needed a new main board and since they 
couldn't get that part, couldn't finish the repair.  Just assuming my 
synth needed a main board also, does anyone here know of a source where 
I could buy such a part?  

Thanks in advance for any help.  I really wanted this great synth and 
hope it can be fixed.