Usb powered on while pc is off on x58 pro

Noob question here, i want my pc to be able to power my usb ports while the power is off so my mp3 player can charge. I managed to do it the other day and now its not working again. >_< its something i changed in the bios i think. Anybody know what options control this?

Have a look in BIOS, under Power Management. If there is a 'Resume on USB' option, set it to enabled.
I just tried this on my system, and now my phone charges when connected while the system is powered off.

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