I have dell latitude c400 pc . Its speakers are not working. but I can talk through usb port via phone. I think that the driver has been overlaped by another driver. I want to revert back and wants my speaker to work.
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yes you will be able to use the USB port, either via a USB to DVD, or hard Drive or Flash Drive,all these can be made to Boot the PC and do as you wish. Go to the web site below and get UBCD, and put it on whatever you want, and use that. You obviously will have to use another PC to do so if yours is out of commission.
http://www.user-guides.co.uk/cddownload/Dell/DellLatitude/Dell-Latitude-C400-XP-Driver-Recovery-CD-Restore-Disk-1420.html at this location you will find and be able to download an cd in image format ..probably ISO ..you have to burn it on a cd ..and use it al the time you reinstall ..I understood that there are all the drivers you need for your model Good luck!
Unfortunately, I have seen this many times. One of the major problems with the C400 model was the USB port failing. I have had many of them replaced under warranty, and I have repaired some. The USB port breaks loose from the mother board and stops working. It is possible to SOMETIMES disassemble the laptop enough to get to the port and re-solder the USB port connections. But is is a slow process for experienced people. And it does not work all of the time. i know that this is not the answer that you wanted.
First check the sound settings, it could just need adjusting. If the settings are correct, then you have a driver glitch, uninstall the sound drivers from the device manager, then reboot. The machine will find the sound card and reinstall the drivers automatically. Then check Dell's support site for updated sound drivers.