I HAVE A NOTEBOOK AND THE WIRELESS HAS DISABLED..HOW DO A ENABLED IT AS THE COMPUTER DOES NOT HAVE A SWITCH OR BUTTON TO TURN IT BACK ON

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Enable / Disable an Enterprise Laptop's Wi-Fi
Wi-Fi, short for Wireless Fidelity, is networking technology that allows you to connect to the Internet. If you have a wireless-enabled Latitude computer you can connect to the Internet when in range of an access point called a hotspot.
When not in use your Latitude's wireless card should be disabled. By disabling Wi-Fi, you will receive two benefits:
Start-up times will be much faster.
If the wireless card is ON and you are out of the office (not connected to your normal, wired connection), the laptop will try to use the Wi-Fi network during the login process to run the various start-up scripts, etc. It will eventually time-out (fail). By having the wireless card turned OFF, the start-up process will be much faster.
Computer will not continually search for a wireless network (and waste battery life).
If you are in the office (connected to your normal, wired connection) or in a location where there is no wireless hotspot, you don't need to have the computer waste processing power by looking and looking for a wireless hotspot. By disabling Wi-Fi, you will gain a little more power for your other tasks. In addition, you will maximize your battery operating time by disabling wireless activity.
NOTE: After your Latitude has started up completely, you can ENABLE the wireless card and connect to a wireless hotspot. For example, a wireless router at your home or at a local coffee shop. If you have connected to this hotspot previously, the wireless card should connect automatically for you.
NOTE: Once you have the wireless card enabled, before you shut down the computer, you should again DISABLE the card. The computer will then be ready for the next time you turn it on with wireless turned off.
Enable / Disable with Hardware Switch
The more recent Latitude models have a wireless switch to enable or disable wireless network devices and the
Wi-Fi Catcher Network Locator.
Dell Latitude E6420 and E6520 Series
These laptops have a small switch on the RIGHT side of the keyboard. The switch is toward the front of the laptop. The Wi-Fi Catcher™ icon will is above the keyboard. You will see a lit radio tower if the wireless switch is enable

Wireless device is turned off or disabled The power to the wireless network and Bluetooth devices is controlled by a switch or button on most computers. It is possible to accidentally bump the button and turn off the wireless service. On most computers, there is an LED light that glows blue when the wireless device is turned on and enabled, and glows orange when off or disabled. Some newer models use different a different color scheme, see the user guide for more information. To turn on and enable the wireless device, do the following:

1. To turn on the wireless device, simply move the switch to the on position. On some computers, the switch is actually a touch point on the panel above the keyboard.
2. To enable the wireless device, right-click the HP Wireless Assistant (disabled) icon and select Open Wireless Assistant . Click Turn On . The HP Wireless Assistant (enabled) icon will display.
3. You can also try pressing the fn+ F2 keys simultaneously to enable the wireless device.
   

It sounds like your WiFi switch was somehow shut off.

Wireless device is turned off or disabled The power to the wireless network and Bluetooth devices is controlled by a switch or button on most computers. It is possible to accidentally bump the button and turn off the wireless service. On most computers, there is an LED light that glows blue when the wireless device is turned on and enabled, and glows orange when off or disabled. Some newer models use different a different color scheme, see the user guide for more information. To turn on and enable the wireless device, do the following:

1. To turn on the wireless device, simply move the switch to the on position. On some computers, the switch is actually a touch point on the panel above the keyboard.
2. To enable the wireless device, right-click the HP Wireless Assistant (disabled) icon and select Open Wireless Assistant . Click Turn On . The HP Wireless Assistant (enabled) icon will display.
3. Or you can try pressing the Fn and the F2 keys at the same time to enable your wireless adapter.
4. Here is a link for your product support page at Hp.com : http://h10025.www1.hp.com/ewfrf /wc/searchResults?tmp_product=Compaq+Presario+V6000T+CTO+Notebook+PC&product=3177516&tmp_qt=turn+on+wireless+switch&lc=en&dlc=en&cc=us
   

From the HP website:

The power to the wireless network and bluetooth devices is controlled by a switch or button on most computers. It is possible to accidentally bump the button and turn off the wireless service. On most computers, there is an LED light that glows blue when the wireless device is turned on and enabled, and glows orange when off or disabled. Some newer models use different a different color scheme. To turn on and enable the wireless device, do the following:

1. To turn on the wireless device, simply move the switch to the on position. On some computers, the switch is actually a touch point on the panel above the keyboard.
2. To enable the wireless device, right-click the HP Wireless Assistant (disabled) icon and select Open Wireless Assistant . Click Turn On . The HP Wireless Assistant (enabled) icon will display.

The power to the wireless network and bluetooth devices is controlled by a switch or button on most computers. It is possible to accidentally bump the button and turn off the wireless service. On most computers, there is an LED light that glows blue when the wireless device is turned on and enabled, and glows orange when off or disabled. Some newer models use different a different color scheme. To turn on and enable the wireless device, do the following:

1. To turn on the wireless device, simply move the switch to the on position. On some computers, the switch is actually a touch point on the panel above the keyboard.
2. To enable the wireless device, right-click the HP Wireless Assistant (disabled) icon and select Open Wireless Assistant . Click Turn On . The HP Wireless Assistant (enabled) icon will display.

There will one of two different types of switches or buttons to enable the wireless networking feature on your notebook.

Button on the front of the notebook:

1. Locate the wireless networking button on the front of the notebook.
   
   
   
2. Press the button to either enable or dislable the wireless networking
3. Once the wireless networking feature is enabled the button will light up amber.
   
   

Switch on the front of the notebook:

1. Locate the wireless networking button on the front of the notebook.
   
   
   
2. Slide the switch to the right to enable or disable the wireless networking feature
   
   Note: The switch will reset back to the left after switched to the right. This is normal and does not indicate the the wireless feature has been disabled.
   
3. Once the wireless networking feature is enabled the button will light up amber.
   
   

There is generally a button or switch that will enable and disable the wireless hardware on your computer. If it is disabled via software instead of hardware, you can go to the control panel, and look for your network settings. You can find your wireless adapter, and make sure it is not disabled.

If there isnt a button on the laptop to switch it on and off, then the easiest way to turn it off is to disable the wireless network adapter.
To do this, open Control Panel and double click Network Connections.
This will then show your wireless and ethernet adapters as icons.
Right click on the wireless adapter and then select "disable".
Your wireless adapter should now show as disabled.
If in the future you want to turn it back on, do the same again but select "enable".

After one month of trying everything, I finally figured this one out.  First turn off and restart your computer.  Then press F10 to enter the System BIOS Settings.  Select F9 (Setup Defaults) and when it asks Load Default Configuration Now? , Enter YES.  Then, press F10 (Save and Exit) and when it asks Save Configuration Changes And Exit Now, Enter YES.  This should restore the wireless LAN button to its original factory settings.  Once you restart the computer the button will be listed as disabled, but press on the button and it should work again.  I hope this helps someone else out!

Verify the wireless network power switch is on. The wireless network device in the computer can be turned on and off. The network power switch is located in different places on different computers. See the User Guide for the location on your model. Most models have a blue LED that glows when the wireless network switch is on Verify the wireless network connection is enabled The connection to a wired or wireless network can be disabled or enabled. To verify the status:

1. Right-click the Network Connection icon in the system tray, and select Network and Sharing Center .
2. Select Manage network connections .
3. Verify the status of the wireless network. In this graphic, the wireless network is disabled.
4. To enable the network, right-click the connection, and select enable . It may take a few seconds for the connection to become enabled.

Post back results so I may assits further if required