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Open control panel -> network and sharing center (Vista/Win 7) and change adapter settings. See if wireless network card is available. If not, get the driver from manufacturers web site and install it.
If the driver is installed, check that WLAN is not disabled by some mechanical button on laptop. Some models have these.
The WLAN may be faulty or the driver got corrupted.
Reinstall the WLAN driver and check the Device Manager to see it the WLAN is working and enabled, if it is then configure it to match your wireless router settings.
If this doesn't work the most likely the WLAN card is faulty.
To get a wireless connection again, purchase a PCMCIA wireless card and insert it into the PCMCAI slot, install the driver for this wireless card and configure it to match your wireless router settings.
1) Verify if Wi-Fi WLAN interface of your notebook is OK. 1a) Check whether HW switch is ON and the wireless system service is running. 1b) Switch on the WLAN Access Point (router) SSID broadcasting. 1c) Scan WLAN networks by the notebook. Can you see your home WLAN? If not, there is HW or SW problem in your wireless adapter probably. If WLAN is visible, continue by next steps.
2) Remove all WLAN security on both sides (AP and notebook): Authentication = none/open, encrytption = none. 3) Activate DHCP server in the router and set the dynamic IP assigning on WLAN notebook interface. 4) Select your home WLAN SSID in the list and try to connect. 5) Wait and check status. Is WLAN connected? Does obtain the notebook an IP address? 6) In success case set the WLAN security.
If you have vista click the start button and in the start search type "hp wireless assistant". It should show up in your list while you type it. Click on it. Once the assistant box shows up, click on "properties". A "settings" box should show up. The main one you need here is "independant controls for installed wireless device". Check that box. The other ones are icons and indicators that you can check at your discretion. If in doubt, check them all. Hit the "apply" button. Then in the upper right hand side of the box hit the button that says "turn on". This should activate the device and if you have a light up indicator on your computer, it should change color or light up. That should do it. Kind of weird how it gets to that point.