I just saw this other thread on your problem, I mean this one here, as opposed to the other one
there

almost mirrors

forgive my humor
as to the light issue look over these:
google
It's a bit confusing about the two computers and two drives?
Could you say like originally there was:
Comp 1 Drive 1
Comp 2 Drive 2
& then you did what?
Comp 2 Drive 1 ? etc. does this make sence?
Changing cables: are you sure they are situated right? Try reversing?
Anyway browse the google search as to the light issue. Maybe that will shed some