Korg Poly800/EX800 Users

Hi ive just bought a broken poly 800, my intention was to fix it and 
convert it so i can have it rack mounted.
Unforunatly it has nothing on the display but when i switch it on i 
can hear power.
Ive taken it apart and with my basic knowledge tried to fix it but 
now realise i have two choices.
Sell it to an electronics expert or buy another faulty one and 
hopefully use parts from both to make a good un.
So my question: does anyone here (from the UK) have a faulty one to 
sell or know where i could get it cheaply repaired.
thanks