Magic 3 crossed wires

[johnboy183]

Thanks for the advice (am already considering a different chip but will probably fit it myself this time). The saga is longer than the brief post i submitted in that I disconnected the chip as part of the troubleshooting and also reconnected the wires as per the Magic installation diagram but have ended up reconnecting it as it had been originally delivered as it seemed to work best this way - but I just cant work out what connecting A to Z and vice versa should do!
I have tried to attach a photo of the wiring as supplied and you will see why I have little faith in the guy who chipped the PS2.
Surely someone can tell me whether A to Z matters - or not?
Many thanks,
johnboy183
(If the jpeg doesnt attach I will try zipping and repost)