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When booting my Raspberry Pi 400, I see this warning. None of the USB ports work once the computer boots.

Have you seen this? I assume it’s a hardware issue because it happens with both RPi OS and Ubuntu.

Thanks for the replies. Looks like I have a bad board and working with the vendor on a replacement.

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@emma That's a bad power supply, I think - do you have an alternative?

@emma if you have a voltmeter to hand, double check the claims on the label. A distressing fraction of USB power supplies are straight up lying about their output.

@mhoye

I tried a couple of other USB supplies and got the same error. There's something wrong with the board most likely. Talking with the vendor.

@Shitlord

Checked with several power supplies. Unfortunately, I think it's board.

@Shitlord

It's a Pi 4 in a keyboard, like a C64. Just plug into a monitor.

@emma Huh, that's pretty. if a pi 4 fits in it, that will be nice once they finish the damn video driver. :)

@emma the usb controller has detected that there is a too high voltage on the ports. As there is nothing connected it could mean that there is a production fault causing a short circuit somewhere. I guess you need to return it and get a replacement unit

@emma Take every USB peripheral out and try to boot again.

If the error goes away, then your peripherals are drawing too much current for the board.

@Sabex

This is happening with all the USB ports unoccupied. It's a board fault.

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