Another question: I just set up and configured one of my S3s, and it was hashing fine, until I rebooted it.
Is this normal?
rebooted how: cgminer, power cycling or poweoff -d command in ssh?
In my opinion S3 does not "like" to be power cycled, especially if you don't give it 10-20 sec before turning it back "ON"
try rebooting the cgminer in . It might work.