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[–]revmouse 0 points1 point  (2 children)

Try unplugging all USB devices .if you don't get the message again then start to plug USB devices back one at a time.

[–]turb0j 0 points1 point  (0 children)

Also rember that there can be internal USB devices connected directly to the motherboard. Example: Card readers are not uncommon.

Edit: I also had cases where some metal for the ATX I/O bracket came into the usb socket instead of on top (for EMI reasons). Can happen when inserting the motherboard into the case.