Problem with soundcard/headphone detection

[DanD]

Hello. First, I'd like to say hello to everybody since this is my first post. I hope this will be a good resource for PC related help. That being said, I have a problem that I hope can be addressed.

I recently purchased a new sound card, Crystal SoundFusion (CS4280), in order to establish a midi connection to my computer with a 15 pin midi cable. I had some initial problems with the drivers, (since the sound card was released before XP), but it is compatible. I was able to get it working after fiddling around for a bit, and everything seemed to be in check until I plugged my headphones into the headphone jack (on the front of my PC), and that was when I noticed no sound was being inputted through the headphones, but sound continued to play out of the speakers. I was wondering if anybody had any advice/suggestions regarding this problem.

Thanks,
Dan