No sound from external speakers...

This was working perfectly until the power went off suddenly the other night, or so I believe. The machine came back up just fine but no sound! Gone through all the usuals... the sound card and driver are fuctioning properly. The speaker system works when connected to another computer. The mute isn't on. The windows advanced play control is set properly. I give up; what could it be? My system is home xp and the speaker system is Altec Lansing with a sub woofer.

any help appreciated.
m

 

Have you tried another sound output device to make sure it is not the speaker system? you can either use a headset or connect the same speaker set to another system.

Also, is this an add-in type sound card or is it integrated onto mobo?

Have you checked to see if the device is reporting any issues in the Device Manager? (Start > Run > devmgmt.msc > OK)