Sound card problems? Is there a card?

This may sound like an odd question for those who have lots of hardware experience, but I am not sure if I actually have a sound card, even after opening the case. I got a Dell Optiplex GX270 which was being used in a call center I think. My ViewSonic monitor with built in speakers has worked fine on my previous system. There is a port which looks like it is for audio on the back of the case, but I can't get any sound to come out at all.
I don't know if there is an app of some kind I can run to see if there is a malfunctioning card.

 

Device Manager
start>control panel>system>hardware>device manager
will give you a complete listing of everything that is installed on your computer
Any item that has a problem should be accompanied by a Yellow Exclamation point.

 

According to the Dell website
http://support.dell.com/support/edocs/systems/opgx270/en/ug/specs.htm
Your computer has a onboard sound card.
The drivers can be had:
http://support.dell.com/support/dow...=-1&impid=-1&formatcnt=1&libid=3&fileid=70114

 

I appreciate everyone's help. Turns out the driver was not installed.
I have Vista Basic on here and am not finding it easy changing from XP to Vista.
Still working on such basics as how to stop Vista from asking me if I really want to do something every time I try to do pretty much anything.

 

You can turn the UAC off (that's what is asking you those questions) in the Security Center in your Control Panel.