Did you turn the cable around or just rotate one end of the cable?
By reversing the cable, we mean rotate the connector on one end of the cable around 180 degrees so what was at pin 1 is now at pin 34 (or whatever).
If one of your CIAs is bad, then swapping the two chips will cause another problem in another part of the Amiga, maybe your mouse will stop working for example.
Hope that helps!
