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I just reconnected my MacBook Pro to all of its normal devices for "desktop" type operation. Now I'm getting a warning: USB Device Needs Power - Connect "Internal Memory Card Reader" to a USB port on this Mac. What does that mean?

Giacomo1968
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BillC
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  • I guess you could open it up and find the internal memory card reader and plug it into a set of usb pins on the motherboard. that's a complete guess though. – barlop Jan 06 '16 at 22:52
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    if you unplug some other USB devices, does the message go away? you may have exceeded the amount of power available to the USB bus internally. – Frank Thomas Jan 06 '16 at 22:52
  • @FrankThomas Universal Serial Bus Bus?? I vote we now call USB BusBus – Some Dude Jan 06 '16 at 23:24
  • A single USB port can only handle a certain amount of devices if those devices are drawing power from that USB devices, even if they are not, then there is still a limit on the number of devices that can be connected to that port. Unless you provide specifics on each device this question will be difficult to answer. – Ramhound Jan 07 '16 at 15:10

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You probably have the Memory Card Reader connected to a USB port on another device that is connected to the MacBook. The warning is telling you to connect that card reader directly to a USB port on your MacBook rather than indirectly via another device.

mahboudz
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  • This sounds right. Something isn't getting enough power. If it had enough power before but not now then something changed. The devices were not plugged in the same place, a powered hub lost power, a loose connection somewhere, or whatever. USB port on a MacBook Pro should provide 1.5 amps of power, an unpowered hub only 500 mA, a powered hub typically 900 mA. – MacGuffin Jan 08 '21 at 18:49