The power supply to my quad cortex makes a high pitched ringing noise when the unit is turned on. I looked through the forums and couldn’t find the exact same issue. tried several plugs around the house but get the same result
That’s a new one…at least I don’t recall seeing any other complaints. Is it still under warranty?
Coil whine is a pretty common thing for a lot of electronic devices, it isn’t harmful or anything like that, just annoying. Seems you maybe got a power supply with a coil more prone to it (bad potting or something along that lines) it can happen. I would ask neural by mail to send over a replacement supply. 
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thanks all, it ended up being my power supply. i actually had a spare with reverse polarity lying around and it works perfectly now.
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