this one here had a flaked monitor with the same symptom.
the cards came loose due to it being moved around a lot.
http://youtu.be/UvrjdrWtrLYI fixed it for the guy and took the humbar out by cleaning up the fuse holders, reflowing those and putting new fuses in.
the crazy climber had a bad edge connector, shit was just twisted together.
these belong to the auctioneer that john won his journey cab from.