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have you tried a different usb socket? Macbooks are notorious for having different power outputs depending on the order of the sockets on the board.
Sumo-
Mid range Lenovo from a few years ago.
Thanks for the suggestion. I had tried it on a USB3 port after it first popped up on the standard USB port, same difference. But following your post tried the 3rd port (USB3) and it seems fine.
No idea if anything rests on this, but it happens to be the port closest to the power supply.
hugo7
I got a fan off ebay and when I plug it into my laptop it says;
There's lots of stuff on the internet about how to fix this pop up. But my question is does it matter? The fan spins.
It's pretty obvious that it's the fan causing the pop up, but surely it can't draw more power than is available?