> You must have really bad luck. I am not sure on the 16F684, but pretty
> much traditionally RA4 is an open-drain pin.
>
> It is the one pin that is a problem for beginners.
>
> For now, try  to use RA3, or RA2, or RA1, or RA0.

Forgot to add, this is still probably good advice whether it's open drain or 
not, as it seems the pin (RA4) is also used as the Osc clock out/in. 
Sticking to RA0 or 1 would be easier. 


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