Posted 06 January 2011 - 02:21 PM
So you have determined that your wireless network via your router, is still functioning like it should, this is good.
The problem is the built in wifi card.
The computer can connect via a 3G dongle, which is good.
Is there a switch on your laptop that turns the wireless on and off. Have you tried putting this switch into the off position, then on?
Have you tried going to the Device Manager to see if everything looks ok.
To get to the device manager right click on My Computer, click on properties, click on the Hardware Tab, the click Device Manager.
Your built in wifi card should be listed under Network Adapters, if the drop down list for that selection is not showing, click the plus sign(+) to drop down the Menu. look for your Atheros Wireless Network Adapter.
Does the Atheros Network adapter have a red "X" or a yellow exclamation "!" point next to it?
Please check that and post back here.
You can also try right clicking on the Atheros network adapter and uninstalling it, retart your computer, and let the drivers get re-installed.