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First check if its a drivers issue.. Unistall the drivers and reinstall the latest drivers from the support website of tashiba... Then try to take the WLAN and reinsert it.. Try to get all the wireless networks again and try to connect.. If the issue is not fixed you may have to replace the WLAN card....
if you are worried about the icons that are sown in the tray system ( lower right in the task bar ) those are showing the other connections that are not working at the time ...for example the LAN cable conection ...and the blue tooth ..those will appear not connected if you have no cable on the Lan card or blue tooth device connection ...even if you are connected via wireless those will appear unless you choose to unchecked the show in tray ... if you are asking about the connection you have made wireless and it doesnt work ...you probably have a driver problem ..just reinstall the driver for the wireless card if you know that the connection should work ...if you have acces on the net wireless those icons that are x-ed on the right on the task bar are for the other connection methods ..so do not worry ..
check into the device manager to see if the lan card is still present ...or the wireless what ever you use to have on .... if used to have a LAN cable Ethernet connection and it is not present in the hardware manager ..(device manager ) it is a problem detecting it or it is dead... to go to manager ...just right click on my computer ..properties...than hardware and device manager ..there u will have a picture about all that it is on ...working ...what it is not present and it should be its not detected or disabled...and what is in yellow..with an ask sign has no driver anymore ...try first to right click on it if you find the lan card in yellow and update driver ...if it doesnt find it ..just insert the driver or reinstall it from where you have it ... if you can not find another Lan card ...and is dead...check for the moment if your wireless is still functional ...and use it for connection ...just buy a cheap wireless router and install it in the wlan at home ...and you will have 4 ports with internet on cable ..and wireless to use with the laptop ..until you get another lan card to match... lets hope is nothing that radical...and it just need a reinstalling ..it also may be still wet ..and cause dysfunctions.....gave it time ...and check it after you reinstall the windows in final... anyway ..to get a router if u will have to use the wireless..will cost just about 30 bucks on ebay ...
Check the Device Manager to see if the Wireless LAN device is working and enabled. If not reinstall the Wireless LAN driver.
If the Wireless LAN is OK and enabled then sometimes when you bootup the Wireless LAN card doesn't get an IP address from the wireless router. This usually has a red X on the wireless connection icon and sometime you get an error message "Limited or no connection".
To get the router to issue the wireless LAN card with a new IP address, righr click on the Wireless icon and click on Repair.
You can also power down the router wait 15secs and power up the router again then reboot the computer.
If it still doesn't work you could have a faulty wireless card, see it your friendly computer shop can test it for you.
the problem can be many:--
1.go to device manager and check under network adapters,,whether any wireless card is present or not,,if yes,,check whether there is a yellow bang beside it??if yes then the drivers need to be reinstalled,,if it still doesnt resolve the prob. then the hardware may be faulty.sometimes u might see a option "network controller" then u need to reinstall the WLAN card drivers.but if you dnt see any option of WLAN card or network controller,then u hav to open up the computer and reseat the card.if still doesnt work,,then replace the card
I have been working with Dell on this problem for quite some time. They tried replacing drivers, uninstalling and re-installing the card, replacing the card with a new one, etc, etc. Nothing worked. Sooner or later the error came back. Their last "fix" was to suggest that I restore the system to factory default condition and start all over again. I refused to do this. I had spent over 8 months adding software, tweaking it and windows, etc. They basically threw up their hands and gave up.
The Dell tech who replaced the card tried the solution noted here and "supposedly" it was fixed. A few weeks later the error came back.