Question about Dell Latitude P4 C640 Business Laptop (C640251240CDRWDVD) PC Notebook

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Power/battery problem

The unit works perfect with only ONE source of power.
if ac adapter is plug batt needs to be out or will never start.
if batt is inn ac power must be out or will never start. and if you have any of them working and plug the other, the unit will shut down right away.
so there is no way to charge the batt. I know batt is ok. cause I tested in another c640 with out any problem, same for the ac adaptor. I have use pa6 and pa9 and is all the same.
is anyone familiar with this failure? pls help
thanks

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  • 191 Answers

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)

Posted on Jun 05, 2008

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This is only the first of many things you may need to do to determine the fault. But it is a process for determining the exact cause.


Make sure the ac adapter is correctly plugged into the notebook and into the power cord.


If everything is plugged in correctly and it still will not power on, follow these steps to complete a 'power reset' of the notebook.

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