The inverter is fried -- 2 repair options: 1) search the inverter board for the most likely culrpit: bad capacitors. They are obvious; instead of being shiny metal with scored marks in it, it will be bulged, or even popped open with black or white residue from the leaking gasses. -- With a soldering iron they are easy and cheap to replace. 2) replace the inverter board. Find a suitable 'broken' donor monitor by part number, and score a good deal on ebay or craigslist for it.