Sound ok after boot but after PC runs for a while, the audio vanishes and sound control panel says No Audio Device. I disabled the on-board audio chip and installed an audio card. Same behavior.
Windows XP, Media Center Edition,SP 2,HP Pavillion, AMD Athlon, dual 64x2, 960 mb Ram, sound blaster audigy in slot 1. When sound functioning the "Sound and Audio Devices Properties" reports the audio device as "Sound Blaster Audigy". Later sound disappears and the panel reports "No Audio Device". If I reboot, the audio system is back to normal for a while.