I have everything working except for one opto endstop. I'm using the techzone remix electronics so the led is lit when nothing is in the sensor and the led turns off when there is something in the sensor. The opto that isn't working has a green led on like the others however if you put something in the sensor, the led only dims. The other two both operate correctly.

Try swapping them to see of the fault is with the opto, the cable or the board.

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[www.hydraraptor.blogspot.com]

A few of my opto endstops had a cold solder joint on the center / signal pin, might be worth checking.

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-Nudel
Blog with RepRap Comic

I'll have to check when i get home tonight. I am seeing infrared light coming from the opto in question and all of the resistors measured the correct resistance. I did swap them and the other two opto's work perfect on the same cable/stepper.