I have an RPI4 running a Plex server, Pihole, etc etc.

Power kept dropping while running certain tasks involving the attached HDD, so I started using a powered USB3 hub - problem solved.

But now the Pi won't boot with the powered USB hub attached. I have to unplug it, wait for boot, then plug it back in.

What am I missing?

  • I think I saw a note about this in the Raspberry Pi forums. You might want to check there for the latest updates on this issue. – bls Jul 16 '19 at 16:10

You have to make sure that you are getting consistent 5V from the USB hub, and at the very least 1 Amp in current... most usb hubs will only regulate to 500 mA which sounds like what you were getting due to the power drops. Did you see a lightning bolt on the screen when working on the Pi either on commandline mode or Desktop? If you did, you got your answer :)

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  • I'll see if I can find out what the hub is doing with power, as I suspect you're correct - however I haven't once seen the lightning bolt! – lukenm Jul 17 '19 at 9:12
  • why did you downvote? It’s a perfectly good possibility and it happens all the time. If this was not the case this time, you didn’t have to downvote just mention in the comments it wasn’t your case. :( – Agustin Jul 17 '19 at 14:20
  • I didn't downvote! In fact, I upvoted. You're absolutely right, that was a correct answer but not quite in this instance. – lukenm Jul 17 '19 at 16:25
  • Aww thanks, I guess someone is trolling around – Agustin Jul 17 '19 at 16:25

I found the exact same issue in a Reddit post and the solution seems to be a frustrating one - find a more expensive powered USB hub. Oh well.

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