We also had a 'dead' machine (DW450) showing no lights at all when we switched it on. Turned out to be one pole of the main on/off switch (LHS of the panel) not making. Linking the blue and purple wires directly fixed the problem. Not the recommended solution but expedient since replacing the switch looked fraught. If you do this insulate it well with electrical tape. NOTE the suppressor causes the mains to appear as split 120/120 on brown and blue so disconnect completely before touching anything.
Ricardo13
May 2015