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Problems with USB devices - USB Root Hub Power Management problems (Vista/Win7)
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Q: My M-Audio USB Audio- or MIDI interface fails to install, doesn't work after installation, or drops out of the system every now and then.  What could be the cause of this?

A: A common reason for such problems is the Power Management function of the USB Root Hub.  Disabling the power management for all USB Root Hubs in your system should resolve this problem:

1. Open the Device Manager (Start-> Control Panel-> Device Manager)
2. Look under the category Universal Serial Bus controllers and find the USB Root Hub.
3. Right click and select Properties, go to the Power Management tab
4. Uncheck the box "Allow the computer to turn off this device to save power." and click "OK".

Repeat this for each of the USB Root Hubs shown in the Device Manager.

It is also recommended to disable USB selective suspend and set your computer's power options for high performance, see this guide.