Hi i just went thru a getting my 5000plus to work from after buying it a couple of weeks ago (non-working project) to a good working unit ,,, if you read all my posts may help as my slot was doing some of the same things you are saying yours is now doing.... the big thing that made mine really start working was to get a set of clear chips and with them i was able to do a complete clear of the ram,,,, but i would try to fix your problem by first shut off the power,,, then pull out the in and out board just enough to disconnet it from the back board,,, leave the ribbon cables hooked up and turn the power back on,,,, this should do and part clear and may clear up the dot problem and fix the coin problem too.... then turn power off again and push the in and out board back in and turn power back on,,,,, when you do this you may see up in the win ch then cl it is just telling you it is clearing .... again think if you read what i went thru on mine over the last couple of weeks will help good luck