I have latitude E6400,th antenna status light (top of keyboard in left) dosen work, anyone can help me?

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

Need to go to the Dell support site they will help you

Annoying problem if you rely 100% on keyboard shortcuts! I had the same problem and the fix is very easy. You will need to uninstall your keyboard driver and restart your computer and your CTRL keys will function once again. To do this:

1) Click Start
2) Control Panel
3) Printers and Other Hardware
4) Keyboard
5) In the Keyboard Properties window, click Hardware
6) Click Properties
7) Click Driver
8) Click Uninstall, click OK
9) Restart your Computer

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.

This happens with this model dell. It's a pain. If it completely stops working except for space bar and perhaps one character it's the keyboard. If not it could be a software glitch. Spill anything on it? Replaced a keyboard for a person who claimed no spill. Found dried milk around perimeter of keyboard once removed. His kids did it. If you have to replace it, it is easy! You don't have to open the computer or really take anything apart. The keyboard is removable from the top by removing the plastic trim at the top of the base above the keyboard. The screen has to be folded all the way back to do this. If you want to replace it, its easy and cheap. Post it for directions.

It probably is battery problem

The small hole is most likely a built in microphone. Web cams are usually at the top of the screen.

For the Dell Latitude E6400 The Webcam is actually optional. To check whether you have it on your laptop look at the top of your screen. On the left of the display latch, you are supposed to find 3 items there if you have a webcam. The left most side is the microphone, so it is actually a very small hole, followed by a small light, the indicator for the webcam and a small circular one that is the webcam. If you do not have any of these on the left side of that latch then your latitude did not come with a webcam.

it looks like a hardware issue. try it if in safe mode it still has the same problem. if so, then replace your kb. and if not, try system restore. type system restore on the start search when you click the start menu. choose the date when your keyboard was working fine.

Most dell keyboard are "released" from underneath, turn your laptop over and look for the screws with a K next to them. Sometimes there is also a samll removable panel at the top of the keyboard hiding 2 screws.