Question about Dell Latitude C640 P4 Mobile Notebook

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Keyboard problem

C640 dell laptop 2,w,s,x, keys don't work i tried a keyboard from a working c610 dell and 1,q,a,z, don't work plus the keys i frist listed my external keyboard woks fine please help thanks.

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Re: keyboard problem

You just need a new keyboard - those are easy to come by check and search for C640 keyboard. New ones should only be about $30-$40.

To remove the keyboard you just remove all the screws on the bottom of the laptop that are marked with the letter "K" then carefully pop the keyboard up.

Let us know if you need further help!

Posted on Jan 12, 2008

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How to turn on/off my wireless switch on my Dell latitude c640

First make sure the Wireless device driver is installed. Press Fn+F2 keys together. This toggles On and Off for wireless adapter. Or find a key with wireless symbol around your keyboard. Or You can go into the network connections from the control panel and enable/disable the wireless network connection.

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For sound and power icon to be available on the system tray
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rate me..

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You have 2 groups of 3 leds:
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Wireless keyboard keys sticking

on most keyboad you can take of each key. Try to get a flat head screw driver and pop it of with some force. You then can clean the keys. If this does not work you might need a new keyboard. Do not use water (or very little)

Sep 20, 2008 | Dell Latitude C640 Notebook

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I'm sorry to say this, but the water has killed your keyboard, and you will need to replace it. There's no way of fixing it, other than replacement.

Aug 23, 2008 | Dell Latitude C640 Notebook

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Press Fn first and hold it and press F4....
The first time it should output only to your S-video,second pressing it should output both s-video and your monitor.

May 03, 2008 | Dell Latitude C640 Notebook

1 Answer

Key board not writing as stated

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Mar 11, 2008 | Dell Latitude C640 Notebook

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This is a rather old question, but the solution might still be helpful to other readers.

I suggest you call Tech Support at Dell...

Several years ago, I worked on many Dell CPx 500 models in my work place. There was an issue that always involved a series of 4 or 5 keys (they were always the same keys) that would quit working and we had attempted to purchase new keyboards to fix the issue. It turned out, the real solution was to replace the 'motherboard' of the Latitude notebook!

Dell had knowledge about the keyboard/motherboard issue that we didn't know.

Jan 11, 2008 | Dell Latitude C640 Notebook

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Dell Laptop (Latitude C540/C640) period key problem

The keyboard can be replaced. Ebay is a great place to get one.
Here is the manual. It will show you how to change it.

Jan 08, 2008 | Dell Latitude C640 Notebook

2 Answers


The "Fn" key is on the lower left corner of your keyboard, to the right of the "CTRL" key. Best regards, torgo

Aug 09, 2007 | Dell Latitude C640 Notebook

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