My dell c400 has no sound device or has sound device problem

If you're tryng to format the HDD on a Dell latitude C400 (or install an OS), this thing will not boot to any USB devices (flash drives, pen drives, external USB cd-rom drives, etc.) - just ain't gonna happen since the BIOS doesn't support such boot devices. The only thing it'll boot to is (1) docking station, and (2) a Media Bay optical drive.

If yoi want to do a system restore...go to start then all programs...accesseries...system tool..in system tools you will see system restore..and if you want to do a factory image restore then you need a restore or recovery disc..insert that restart the conputer ..press f12 select cd-dvd rom hit enter then follow the instructuons to do the restore...and if sound is not working then check the drivers for the sound in device manger

try to buy a cd reader for laptops or buy a new usb and put on usb windows

Here are all drivers for Dell Latitude C400

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!

device driver's are different from one operation system to another...you need to find the driver for the current operating system...

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.

I would venture a guess (not knowing anything about your particular model) there is one of two volume controls on the unit itself:

- Part of the keyboard, generally bearing a speaker insignia of some kind. If it's part of another key (ex. the up/down arrows) you may need to hold the Fn key down while simultaneously pressing the aforementioned keys.

- Somewhere along the sides or the front, a rotary device of sorts. Something like you might find on a walkman or discman to adjust the volume.

If not either of those then perhaps a hardware issue of some kind.

Remove the card and use system restore in accesories to see if you can restore to a time previous to installing the card. If the problem persists, you can run dxdiag, go to start>run, then type dxdiag and hit enter, go to the audio tab and it will point to the problem

Go to the Dell website and download the XP video and display drivers:- http://support.dell.com/support/downloads/devices.aspx?c=us&l=en&s=gen&SystemID=LAT_PNT_P3_C400&os=WW1&osl=EN