Verify that your access point or wireless router is functioning correctly.
Check the Network name (SSID) of the wireless network and verify that the access point or wireless router is set to broadcast the Network name (SSID).
Change the channel on the access point or wireless router to channel 1 and retest. If the problem persists, change the channel on the access point or wireless router to channel 11 and retest. If the problem persists, change the channel on the access point or wireless router to channel 6 and retest.