Download AND install the audio driver. Choose what Windows operating system you are using, first.
Driver: Small piece of software that allows the Operating System to communicate with a device
The device is the Audio chipset.
The operating system wasn't stated.
(Be sure to restart your computer after INSTALLING audio driver)http://www.dell.com/support/drivers/us/en/19/Product/inspiron-2200
Using Windows XP for an example;
Scroll down a little, click on the blue Down Arrow to the left of -
Click on - Download File - to the right.
Single-file download has a Green checkmark in it's small circle.
IF not; click in the small empty circle, to the left of -
Then click on Continue in the blue oval 'button'.
A small window will come up -
Click on Save File.
A small download window will come up.
Allow the file to fully download, then DOUBLE-click right on it.
(If a Microsoft 'squawk box' comes up, ignore it. Click on OK.
Second one? Click on Run)
At the bottom of the 3 small windows, click on Next, Next, and Finish.
If you are not asked to restart your computer, do so.
IF, this doesn't cure the problem, suggest your audio chipset is bad, on motherboard.
Since it is a laptop, NO; there is no replacing a sound card.