Mac Mini USB power

[Guitarfreakk89]

Hi, I have a USB DAC( digital Analogue converter), the unit is supposed to shut itself off when the computer shuts down, and was doing so until I installed leopard. While I was trying to determine whether it was the computer or the DAC I realized that if I unplug the Mac Mini from the power supply the DAC shuts off.  Is there some new setting that continues to power the USB ports even after shutdown?  ( possibly for charging devices)    Mac Mini 1.83 Ghz OSX 10.5.1

[krissel]

Well, you are not alone in your observation.

http://discussions.apple.com/thread.jspa?t...07&tstart=0

Even though it referred to iTunes, it is still the same situation. Despite the confusion by some responders it echoes your problem. The last poster has noticed it as well.