Where do you install the sound card?

http://www-307.ibm.com/pc/support/site.wss/MIGR-55386.html

log on to this site:www.tomshardware.com

Check Device Manager to see if the wireless card is enabled and working. If it has a yellow ? against it then the wireless card driver was not installed.
Some model ThinkPads have different network cards drivers and unless you know exactly which one is installed in your ThinkPad, you need to download all the network drivers and install each driver until you find the right driver.
When you download the drivers, write down the device driver and it’s file name so you have a record of which driver you are installing and which directory the unzipped files are located on your hard drive.
Go to the IBM/Lenovo WEB site - support/download page and download the latest Windows XP or Vista device drivers for your model computer, Use this link: -
http://www-307.ibm.com/pc/support/site.wss/product.do?template=%2Fproductselection%2Flandingpages%2FbrowseByProductLandingPage.vm&sitestyle=lenovo&brandind=10&validate=true
You can download the various drivers and then you click on and run the various driver files, they will then unzip and expand into a sub folder on C:\drivers Then install the various drivers from this folder (run the set-up file).

http://www-307.ibm.com/pc/support/site.wss/MIGR-55386.html
http://www.driverfiles.net/Notebooks/IBM/ThinkPad-T42,-T42p/download/page,sh,27550,70,19,.html
http://notebook.driversdown.com/notebook-drivers/s_1280_1.shtml
here are some links maybe they can help you out

It seems eaither your wireless card has gone bad or it need to be reseated. Its quite easy to take out the wireless card and install it back. Try it and if this does not work you need to ask IBM to send you a new Wireless card if its under warranty or buy a new external wireless card.

Regards,

Jamil

It should be part of the mainboard rather than a separate card. Try uninstalling the drivers, then reboot and see if it detects new hardware.

download the intel chipset driver

http://www-307.ibm.com/pc/support/site.wss/MIGR-46058.html

The T42 has a bulit-in wireless network adapter and a LAN network card. T42s most likely have an Intel wireless card or less likely a Cisco wireless card.
Your wireless network adapter may have been disabled in the BIOS
and/or
The drivers for the wireless network controller has not been installed.

To check the network adapter go to the Control Panel, Click on System, click on Hardware Tab then Device Manager. Then scroll down and click on Network adapters. If you don't see your network controller or you see a yellow ? against Other devices for the Network controller. Then either it has been disabled and/or the driver was not installed.

To get the driver for the network controller you need to dowload it from the IBM/Lenovo WEB site their support/download page from a computer that has Internet access. Make sure you select your laptop model and the driver for your Windows version.
Install the driver and you then need to configure the wireless adapter to suit your wireless router settings before you can access the Internet.

yes you need to also install the drivers cd. it came with the windows cd when you bought your lappy. it should be called drivers and utilities or something along those lines :)

First, go in and remove the service pack 3. This sp has done nothing but create conflicts with operating systems and software. You don't need it. Then go into the device manager and uninstall the sound drivers and reboot. The machine will find the sound card and reinstall the drivers automatically. Then you should be good to go.