Hi
I have a Luck Seven (system 3 Williams) boots / plays no issues on original board set. To go into diagnostics on a system 3 you have to get to audits 04-?? and put into Auto so the audits scroll through. Press advance twice at about 1/2 sec interval and hey presto .. displays go out as expected. But when you press the advance again nothing, displays remain blank and I have to switch off and back on to boot into attract again . Any ideas