Hmm could be that u hear the power brick of the laptop switching thru different power modes during start up. you could try to shield the laptop or parts of it to track down where exactly it comes from
this post was submitted on 12 Jun 2025
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Interesting thought! I’ll try running on battery tonight to see if it clears things up
I'd recommend you explore https://qrm.guru/ to determine exactly where the noise is coming from and what to do about it.