How to determine which USB Accessory is using too much power?

I just started getting this message

USB Accessories Disabled: Unplug the accessory using too much power to re-enable USB devices.

I powered down after the first time I got it but then it came back.

  1. My setup has not changed, so why now?

  2. Is there a way to figure this out besides unplugging everything and replugging things one at a time?

Try Apple -About this Mac - System Report


1 Like

I cannot answer your question about how to identify the offending device.

I do have some questions of my own though:

  • What machine are you using?
  • If it is a laptop, is the laptop running on battery? And if so, is the battery old?
  • Are you using a USB hub? Is the hub powered?
  • Are any of the USB devices powered directly? Has the power cord been disconnected? (We have cats …) Perhaps a power supply has died? (Happened, but not because of said cats.)

Happy troubleshooting!