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If you get a 'Limited connectivity" on you wirelessconnection on your laptop, it means that the wireless card on your laptopprobably did not get an IP address from the wireless router. To fix this problem, right click on the wireless icon on the Task bar and thenclick Repair. This will force the wireless router to issue a IP address to the wireless cardon the laptop.
Check the BIOS setting - the wireless card needs to be enabled.
Next check Control Panel - Device Manager - Network Connections. The wireless card it should be enabled and working. If it has a yellow ? against the wireless card then the wireless card driver needs to be installed.
For details on configuring and securing a wireless router and configuring the wireless card in the computer, please click on this link and follow my instructions :- http://www.fixya.com/support/r3559128-wireless_router_security
The T30 laptops do not have a on/off button that turns the wireless card on.
Once the wireless card driver is installed the wireless card will detect any wireless router and access point within its range. You need to configure the wireless card to connect into the wireless router or access point eg. the encryption, SSID etc.
The Thinkpad laptops have different wireless LAN cards installed, when you install a wireless card driver and it doesn't work, then install a different model wireless card driver. Also make sure the XP or Vista version of the wireless driver matches the Windows version that is installed on the laptop.
Check the Device Manager to see if the Wireless card is working and enabled. If not reinstall the wireless card driver.
If this doesn't work, you may have a faulty wireless card.
If the wireless card is not built-in remove it and insert it into another computer to test the wireless card.
If your other laptop is working fine, then have a look at the configuration of the wireless card and use the same configuration on the one that is not working.
Depending upon your wireless card make there is a program that enable you to setup the wireless card. Go to Start - Programs to locate this program. If your wireless card is built-in refer to your Acer manual.
Encryption is setup on the wireless router and these settings are also used to configure the wireless card. If the encryption is already setup, changing the encryption will affect your other wireless card, therefore all the wireless cards will need to be reconfigured with the new encryption to work with the wireless router.
The particular wireless card that comes stock in those laptops is horrible. I work for a school district and we have 10 of those laptops in a school library with a wireless access point. They constantly lose connection, don't get an IP address and generally don't work well at all.
We have tested everything we can and have narrowed it down to the fact that that particular wireless card is a piece of junk. We are currently outfitting all of those laptops with new PCMCIA Wireless cards. We tested a single laptop using a new card in the slot and disabled the internal wireless. After that was done, the laptop worked like a charm.
For a comparison, we have other laptops in that same library that have an Intel wireless card instead of the Dell one. They have always connected fine and with no issue to the same Wireless Access Point that the Dell wireless has problems with.