Dell e6400 can't use the @ key - Dell Computers & Internet

there's a switch on the right side near the audio jacks. turn it to on. if not look at your fcn keys and see if you have one with an antenna with signal marks on it.

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Yes this model Dell has a built-in 0.3 megapixel WEBcam. It is located at the top of the screen.

one quick simple test to see if the key works is hold the Fn key and press the power button on a clod boot from power off state. If the PSA diagnostics start the Fn button is functional, and we'll need to troubleshoot other issues.
If the PSA diagnostics do not start, then reseat the keyboard (It has a slot connector into the palmrest) and see if that resolves. If still no change, replace 1st the keyboard, and if that doesn't resolve the palmrest.
http://support.dell.com/support/edocs/systems/late6400/en/sm/html/keyboard.htm#wp1179980

The Keyboard is fault down one track. You could plug in a usb keyboard as a temporary measure or buy a replacement off ebay for about £25.00, its quite easy to replace the keyboard.

Hi,

You can use the ethernet port or the wireless LAN of your laptop to connect to the internet. You can refer to the link below for the specification of your laptop

http://gdgt.com/dell/latitude/e6400/specs/

Also refer to the link below for the location of the Ethernet LAN port of your laptop.

http://gadgets.softpedia.com/images/news/Dell-Latitude-E6400-Notebook-Review-66.jpg

Its either going to be Prnt Sc or press the Fn key and then the Prnt Sc

One of the "F" keys on your laptop has a wireless tower icon on it (looks like a straight verital line with commas on either side). Press that key without holding down the "fn" key and your wireless should activate.