In this post a member of the fredmiranda.com forum had a problem setting his Canon 580EXII as master to the Canon 420EX.There is some good tips and pictured explenations on how to solve this problem and set the 580EX master for the 420EX.
The link to the post.
580ex II master mode does not appear to work? -good master/slave post at fredmiranda.com,
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