Dell latitude c640 audio problems

If you go to control panel/system/hardware/device manager. You can roll back to your previous driver. Unless of course it wasn't working then either. In that case disregard this solution : )

The drivers for c540 and c640 are different.

C540 Drivers - http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&ServiceTag=&SystemID=LAT_PNT_CEL_C540&os=WW1&osl=en&catid=&impid=

C640 Drivers - http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&os=WW1&osl=en&catid=&impid=&SystemID=LAT_PNT_P4N_C640

Check the device manager to check if all your devices are working properly.

Assuming you are using Windows XP
Crystal Driver
Applies to
CS2405
Download Dell Latitude C640 Audio Driver

I hope this resolves your problem

In case you need any other drivers for the same model or different operating system
Download other Drivers

All the best

http://supportapj.dell.com/support/downloads/driverslist.aspx?c=in&l=en&s=gen&ServiceTag=&SystemID=LAT_PNT_P4N_C640&os=WW1&osl=en&catid=&impid=

download drivers from here

Windows Vista is not supported on Dell Latitude C540/C640. There are no drivers for the hardware of this model. Many older computers have that problem. You can try Microsoft to see if they even exist: http://www.microsoft.com/uk/windows/products/windowsvista/buyorupgrade/upgradeadvisor.mspx
You might have to fall back to XP.




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check sound card

what u should do is
turn off your system
press and hold Fn key,power on the system, leave Fn key
computer will perform a diag
after those diags you will get 4 options you have to choose symptom TREE
you will get options look for any option which says sound or audio
if you hear sounds at that time you need to reinstall the drivers as it states that sound card is working fine
or else
provide me your system's service tag located at the bottom pannel of your system, turn it upside down you will find a bar coded sticker which has a 7 digit alphanumeric number
it will be much more easier for me to provide u a resolution

i installed windows xp service pack 3 in dell c640 latitude laptop after which the multimedia audio controller driver is not installed.

Try installing Microsoft UAA Drivers, you can find em in google.