I have a new PC, 2.0 ghz pentium IV, XP home operating system, 19 inch high res monitor etc. When we got it the sound worked in that we got the log on sounds and the radio thing worked. After a few days we lost all sound. CDs make no sound, we get no sound from the system. Our DVD player can show the images but no sound happens. Are our speakers a problem? Is it the sound card? Being a P IV the sound card is on the mother board. I expect the drivers are OK as they were installed on the system when we got it. I think the problem started before we installed PowerDVD 4.0 but I am not entirely sure.

Does anyone have any suggestions?

This may sound dumb, but have you checked volume level or maybe your master volume is set to mute?
One other thing, make sure that your all cable connections are secure..

Yes it may sound a bit dumb but the question is always worth asking. I had checked those things.

The speakers had died. When we plugged them into the power the led came on but when we connected the same speakers to a midi hi-fi we have nothing happened. We used another set of speakers and it all worked fine.

I am now looking for a new set of speakers for the PC to fully appreciate the 19 " monitor and DVD. I'll be putting a TV card into it over the weekend. Any suggestions?