further observations on sound issue

After I turned off my home PC this morning I realised I could still hear the high pitched whine (when I put my head near it). And it changes in tone when I plug or unplug the network cable. Of course, being an ATX machine when it is ‘turned off’ it’s more like it is in a standby mode so it can do wake-on-LAN and similar – the network interface is still active. This still indicates the problem must be at a low level. When I turn off the physical power switch on the back the whine goes away.

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