[H] dead on board sound

[Winterlight]

I have a old ASUS PC-DL Deluxe Xenon motherboard that I decided to 
start using again. It served for four years 24/7 as my primary 
computer. It has onboard Soundmax sound. I set it up with a dual boot 
XP PRO and Windows 7 PRO. For the first time on this board I set it 
up to overclock from 3.53GHZ to 3400GHZ . I did 24 hour Prime95 burn 
ins to make sure everything was stable. It is a PCP&C 510 PS. It 
isn't even running particularly hot. The RAM is faster then the bus 
requires, and this motherboard is set up for overclocking so I 
haven't worried about the PCI bus.

 But then my sound card has apparently died. The driver installs 
normally, no error messages, windows plays as if there was sound 
there just isn't any sound. I tested speakers and they are fine. It 
is the same the exact same problem in both OSes so it is a hardware 
problem. The BIOS has AC97 enabled as it should. The speakers are 
test good. Just no sound.

So I figure a  circa 2004 motherboard has lost it's onboard audio 
chip. I can stick a PCI sound card in. But I am wondering if the 
overclocking could of taken out the sound chip? I have onboard sound 
go bad with interference but never just die like this. Maybe I 
shouldn't stress this old board by overclocking? Any thoughts?

m