Laptop intermittent electrical noise picked up by analog audio
My Dell Laptop XP intermittently generates electrical noise that my analog outboard audio gear is picking up. Even with all USB cables disconnected so therefore peripherals including the connection to the audio interface, and running on batteries - so now power connection or ground-loop issues - the only time the noise NEVER happens is when the laptop is powered down.
It's an SSD drive so I suppose it's possible that read/write could cause that but I tried some disk activity stuff with a disk cleanup while the noise wasn't occurring, but it didn't make it appear. When it does occur, moving the mouse around frantically on the screen seems to stop it - suggesting that I am interrupting something - and returns when I stop.
Anyone heard of this problem?
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