Question about Dell Latitude C640 Notebook

3 Answers

No power I have a c640 with a decent battery, new adapter and it still wont power up.

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  • pleasefixit Sep 10, 2007

    How much would that cost?

  • testcase22 Mar 01, 2008

    Hi, since this morning my Dell Latitude C640 won't boot:

    There is exactly 0 reaction to pressing the power button.

    No LEDs flashing, nothing at all.

    All is plugged in, AC-Adapter light is a steady green.

    I tried removing the keyboard, booting from battery, with or without CD drive and/or battery, with and without the memory modules, no change whatsoever.

    Any help is welcome.

    Is there some kind of motherboard reset function?

    The strange thing is that nothing special has happened between yesterday and today. :.(

  • happycrazy Apr 20, 2009

    new battery new adapter no power



3 Answers


Posted on Mar 11, 2008

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  • 8 Answers

If its loose where you plug the adapter in, its that your dc power jack pins have come loose from the motherboard due to heat/broken soldering joint/tilting it.
this can be fix by a experienced certified tech in a computer shop that can solder the pins on the dc power jack back to the motherboard.
hope this helps.

Posted on Feb 17, 2008

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Try to remove the battery and then plug the power adapter only. If does not power up try with battery only and then if not your motherboard is bad. You can send it to us and we will fix it

Posted on Sep 10, 2007

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Posted on Jan 02, 2017

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Dell c640 laptop when not power on when using ac

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If it will not power on from battery or AC adapter, Either the power switch is bad - OR the motherboard is shot - OR the LCD is not working. I would suggest taking it to a local PC shop and having it diagnosed, usually this costs about $30 I work for TechSupportPros of Spokane, WA and charge $30 to diagnose computers.

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Is the battery charging when you plug the power supply? If not, while the battery and the power supply is plugged in go to BIOS, that will be F2 when your computer boots up, from there check on battery health or battery info you will also see the ac adapter if it's detected if it says unknown try to use another ac adapter if it is detected still try to use another adapter. If you still have the same problem after trying a new one. You'll need to replace the motherboard

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Try using the A/C adapter without the battery connected and see if your unit boots.
If it does, you will need a new battery, if it does not, question: do you see the led light up when you plug in the charger adapter ?
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Nov 24, 2009 | Dell Latitude C640 Notebook

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Hi iv got a dell c640 when i swith it on the power goes off before it boots up I nearly got to safe mode once but power went again. The battery is ok but after it turns it self off its showing no signs of...

sounds like a motherboard port. remove the battery and try to power it on again with the AC adapter. If same issue, try another AC adapter, try removing the hard disk and DVD drive if available, and test it again.. If no luck, request for a motherboard replacement if within warranty, otherwise, you will have to contact their sales support to purchase a replacement board

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This sounds like a voltage regulator problem. You should have it serviced. If it is under warrenty contact dell, and if not any major computer shop should be able to assist you. Sometimes they can get the replacement parts and service this in store, but more often they will ship it out to have it serviced if it is at all possible. This is not a problem you can solve yourself without a significant amount of know how in laptop repairs. Please rate this solution below, as to how nobody has yet to do so for any of my solutions. Good Luck

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