Canon EOS 60D not working

I have had this camera for about 4 years and used it occasionally as a backup to my 5D Mk 3. A couple of weeks ago I went to use it and it dosnt turn on. Screen is blank as if battery was dead. I changed to a fully charged battery but still no joy. I sent it off to a company called Fixation for a repair quote but sadly they advise me they cannot do anything as parts are not available.
Its a shame as the camera is mint. Any suggestions?
Its a shame as the camera is mint. Any suggestions?

If repair still needed when you get it back I recommend Johnston's in Glasgow , they are excellent.