You can restart the access point by one of the following mehtods
1. Remove the power and replug the power cable
2. Using the CLI in the ap prompt type boot command. i.e [ap:boot]
3. In the Web interface use the System Configuration Setup page to restart the access point. Click Warm Restart System Now to perform a warm restart of the access point. A warm restart reboots the access point. Click Cold Restart System Now to perform a cold restart of the access point. A cold restart is the equivalent of removing and then reapplying power for the access point.