Just got 2 ROLLER DISCOs ... got one mostly working ... other one won't start a game and score displays flash from "000,000" to "EE" (but the top of the E is missing) ... is this an "error" message ... ordering an Owners Manual and stuff tomorrow ... but have tomorrow off and was hoping to work on it ... P.S. Both sets of boards were suppose to be working ... I took the MPU out of the unworking game and put it in the working game > and it shows same "code" in the game that was working ... Also, is likely that unworking game fried something on MPU ... and if so, what should I check ? P.S.S. After I tried starting bad game > I noticed the power cord wasn't grounded so I replaced power cord but still not working ... THANK YOU !!!