Crow:
I don't WANT the other arduino powered. I've tried putting resistors on the digital pins, but it's still powering up, and now I'm getting "sync" errors ...
You don't want the Arduino powered? Wouldn't it be easier to omit it altogether?
... but the Arduinos aren't getting any info, and the example routines don't work.
Because they are unpowered? Be reasonable and give more information. What example routines anyway?