Having the strobing problem myself now. Tried re-seating all the cables as mentioned above but no joy.

Bought a new CAT 5e cable but the plugs are different on the Stern cables (that would explain why the sheathing is removed on the end of the stern cables).

Strobing stops if I pull one of the GI connectors from the board on the bottom. I pulled the spot light GI so game plays normally but I want to get this working.

Unless someone has a better idea than buying another cable off stern I guess that is what I am going to do for now.

Thanks I will try that!
Because I tried everything else including a new cable and pulling most of the bulbs looking for a short...

Swapped the boards and still have the strobing

So it's not the CAT cable and it's not the small GI board under the playfield... I guess I will have to check all the bulbs again for a short that I may have missed the first time round.

BTW... the strobing usually stops when I pull the white GI connector... so I am assuming it is one of those bulbs unless someone knows any better...

Sorry for the late reply on my situation... the problem is now solved, here was the issue...

My issue was with the rectifier (the one with the big heat sink) located in the bottom left side of the backbox. Seems like the connectors got a little oxidized. Cleaned them up, then reconnected and now the strobing is gone! I don't think this solution was given anywhere in pinside so add it to the list of things to check when your game lighting is flickering.