Question about Dell Latitude C640 Notebook

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Dell C640 will not power up w/ac ad - Dell Latitude C640 Notebook

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  1. Verify that the AC adapter brick is receiving power.
    Shut down the computer and unplug the adapter from the system first and then from the power socket. Wait 5 seconds.
  2. Plug the adapter directly into the wall socket, bypassing surge protectors, UPS units, or extension cords. The adapter LED should produce a steady green light.
  3. If you do not get a green light, try the adapter in another wall outlet in another room or verify that the first outlet works with a lamp or hairdryer.
  4. You can also isolate the power problem to a bad adapter by swapping it out with a second adapter - such as one for use with the port replicator.
  5. If the adapter LED lights, check the computer for bad connections.
  6. Examine the system power socket to be sure it does not have any bent, missing, or pushed-in pins.
  7. Plug the adapter connector directly into the computer, bypassing surge protectors, extension cords, etc. Be sure that the adapter connector fits tightly into the computer's power socket.
  8. If you have access to another computer like yours, try your adapter on it or its adapter on your computer.
  9. If your computer is still under warranty and the AC adapter does not respond to troubleshooting, please contact your computer manufacturer.

Posted on Jul 19, 2010

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2 Answers

Dell c640 laptop when not power on when using ac


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

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let us know how it goes.

if it still doesn't work, time for a warranty replacement.

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To my surprise, dell provides dis-assembly instructions online: http://support.dell.com/support/edocs/systems/latc640/sm_en/sysboard.htm#1000473

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You might want to try another AC adapter. If it works, then call up Dell and have replacement on the AC adapter. Otherwise, call up Dell and have them check your motherboard. If the warranty is still active, then can still definitely replace that.

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Power/battery problem


just log on to support.dell.com
click on drivers and download
punchin your system's servica tag
download BIOS updates
but it will only be done if ac adapter and battery are both connected if its not
than it could be an issue with the systemboard and will be replaced if you live in US call 1-800-624-9896(DELL)

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