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.

Posted by on

  • 1 more comment 
  • 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


  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 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


  • Level 1:

    An expert who has achieved level 1.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 5 Answers

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

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

Dell c640 laptop when not power on when using ac

The battery has a dry cell causing this so replace the battery

Jun 20, 2010 | Dell Latitude C640 Notebook

1 Answer

I just bought a Dell latitude model number PP01L. When i plug the power cord into the AC adapter the light on it turns on. but when i plug in the adapter part into the laptop the light turns off and the...

Try it with all devices disconnected from the laptop. Sometimes defective USB devices will cause this. Then try it with no battery. This will isolate the problem for you. If it still happens with no battery or other devices, then the problem is either in the adapter or the laptop. If you bought the laptop new, then contact Dell tech support for help. If not, try a local shop. They should be able to connect another adapter to check the problem.

Apr 21, 2010 | Dell Latitude C640 Notebook

1 Answer

C640 stopped powering up

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.

Feb 05, 2010 | Dell Latitude C640 Notebook

1 Answer

The power supply to my c640 has a green light that flashes when plugged into the laptop, if i unplug it from the laptop, the light stays steady and green, do i have aproblem, the laptop will not power up...

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

Jan 31, 2010 | Dell Latitude C640 Notebook

1 Answer

No AC, battery only, works in Dock

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 ?
If you do not, you may need another charger.

Nov 24, 2009 | Dell Latitude C640 Notebook

2 Answers

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

Oct 23, 2009 | Dell Latitude C640 Notebook

2 Answers

Latitude c640

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

Jan 19, 2008 | Dell Latitude C640 Notebook

Not finding what you are looking for?
Dell Latitude C640 Notebook Logo

Related Topics:

291 people viewed this question

Ask a Question

Usually answered in minutes!

Top Dell Computers & Internet Experts


Level 3 Expert

13434 Answers

Thomas F. Schneider

Level 3 Expert

2715 Answers

Brad Brown

Level 3 Expert

18165 Answers

Are you a Dell Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides