OK, this has been going on as long as I've had Seven, but it's getting irritating. When my PC hasn't been playing any sound for about 30 secs, the on board audio switches itself off. If I then play some sound, it switches back on and works fine. The trouble is, switching on and off both yield a nasty crackling, popping noise from the speakers, similar to what you get if you pull out an audio jack without turning off the amp. Can anyone tell me how to disable this feature so that the audio hardware just stays on permanently? Or at least how to alter the delay? I'm using an Asus M2N32-SLI Delux motherboard, which has a "SoundMAX ADI AD1988B 8-channel CODEC" according to the manual.