Make sure the wireless switch is on. It will be either a sliding switch on the left or right side edge of the computer, a key combination or single key. Look for the universal wireless icon next to the switch, which appears as a radio tower with two signal arcs on each side.
For more information on where the wireless switch is located for your specific computer, browse to the Product support page for your computer model to view the User Guide's wireless switch information section.
Move the computer to within 10-20 ft (1-3 meters) of the wireless router.
Make sure the correct network name (SSID) and key (if any) were used to create a profile.
(For more information on how to perform these steps refer to the appropriate sections in the Dell Knowledge Base article, "Wireless Networking for the Home for Windows 8".)
From the Start page, click Desktop.
Right-click the network icon or in the notification area of your taskbar, and then click Troubleshoot problems and follow the instructions.
For more information on opening the computer and reseating the wireless adapter and antennas for your specific computer, browse to the Product support page for your computer model to view the User Guide's wireless switch information section.
Disconnect the power from the broadband modem and leave the broadband modem disconnected for at least 3 minutes.
Shut down all the computers that are connected to the network.
Disconnect the power from the wireless router.
Verify that a network cable is connected from the Broadband Modem into the Internet or WAN port on the wireless router.
Verify that no USB cables or serial cables are connected to the Broadband Modem.
Connect the power to the broadband modem. Wait for at least 2 minutes for the Broadband Modem to initialize.
(If the Modem does not establish an Internet connection successfully, unplug the Modem. Wait for at least 5 minutes, then plug in the Modem.)
Connect the power to the wireless router. Wait for at least 2 minutes for the wireless router to initialize.
Turn on the computer and try connecting to the Internet.