I have a strange problem. My speaker was working alright in my Windows XP Professional SP2. Suddenly, I did not hear any sounds. I tried all possible combination to fix the issue. The following covers almost all of them.
Check the device manager for any driver missing issues / yellow exclammation marks, mute button enabled for volume controls and also checked the BIOS if the audio device is enabled.
Finally, checked the speakers in another machine and it worked. Since it was an on-board sound card (Mercury Board - KOBP4M266A), I thought the issue could be with the sound card itself and purchased a NEW 4 channel PCI sound card. Installing that (Windows installed its drivers automatically - It was a "Crystal Soundfusion Audio device" driver) did not resolve my problem.
Now, when I see under the device manger, both the devices (AC'97 audio device from VIA technologies, which came with my mother board) and this one (Crystal Sound fusion audio device from the PCI sound card) both are listed and status shows as "Working properly" and "No conflicts". I also checked my PCI sound card in another machine and sound was heard alright.
I don't know where could be the issue with sound in my system.
Can some one help me resolve this quickly, as I have been having this issue for over 2-3 weeks now and tried all forums in the net, but not found a solution that fits my case.
Thanks for your inputs in resolving this.