OMG I did not think there were any of those still running. Seriously, you may have a collectable on your hands. I would try to sell this to a collector and buy a new laptop or tablet, and one of the Coleco/Nintendo, etc game collections and play your heart out.
In a previous life I built my first 2 computers by hand, built the expansion interface for my TRS80, and did custom hardware and software design for a while. I do not have any idea where you would go for help with your problem. You could try a google search for "commodore repair" and see what you get.
Good luck, just my thoughts.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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