'Ticking' sound on soundcard line-out 2007-07-02 22:22:10 Unsure where to post this, but seems like an audio hardware problem to me...Have recently built a new system - ASRock AliveNF6G-DVI, nVidia MP61 chipset, Athlon (Lima) 64 3800+ CPU, running WinXP Home SP2. On connecting the on-board Realtek line-out to my stereo system I hear what sounds like a metronome ticking away in the background with a 1 second interval. It starts as Windows loads but isn't audible during POST or when using BIOS setup.It sounds as if it might be a hardware polling circuit - the only software I'm running that polls the hardware is Speedfan but the ticking noise is present whether Speedfan is running or not. The ticking sound is not audible on recordings made from my stereo system via the soundcard's line-in connector. Tested this by recording a short clip from the FM tuner, loaded it onto a USB stick and plugged the USB stick into the stereo system - no ticking on playback.The only hardware component I can think that might be the culprit is the 4 pin PWM fan on the CPU, but why would it affect line-out and not line-in ?Hope someone can help - I have a 120GB ext USB drive full of music I can't listen to !!