cause its a compaq man you dont buy compaqs lol. so first you should try a new video card then you should RMA it if the video card works then its the cpu or mobo. try that in a differnet system lol. then it could be your soundcard, nah im jk lol hows the sound working?
its a pretty good card, its useful to have EAX support in cs but there isnt much a difference. i only have stereo speakers as well, i need to get some 2.1 channel....