The sound card is integrated into the system board (motherboard). If your audio circuit is defective then you will have to replace the system board.
Try running diagnostics on yourcomputer to see if you have a hardware problem. You should have a CD that camewith the computer that has "Diagnostics and Utilities" listed undercontents. Boot form this CD and run the extended diagnostics.
If you don't have the CD you can go to www.support.dell.com and select "Drivers and Downloads". Enter the"service tag" (serial number) of the computer. You can then download"Diagnostics" .
To boot from a CD disk, power on your computer and tap the key tobring you to the "One time boot menu". Insert the CD into the top CD/DVD driveand then select "Boot from CD/DVD" and hit key. Select the"Run the 32 Bit Dell Diagnostics.
If all tests pass then reload OS ( Operating Software ).
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