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I entered the key in hex and clicked the submit button. Next, I went to a laptop computer that already had 802.11g built in. Until I'd enabled encryption on the access point, everything had been (in technical terms) hunky-dory. Now, of course, the access point couldn't be reached.
So I went through the configuration for the 802.11g hardware (designed for the laptop by Hewlett-Packard), entered the same hex key as I'd entered into the access point, and confirmed that the rest of the settings were correct.
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