Q: I’ve plugged my M-Audio USB Audio device into my computer’s USB port, but it failed to power up. The power switch on the device is on, so why isn’t the device powering up?

 A: The M-Audio Ozone, Audiophile USB, Black Box, Quattro USB, Duo USB, and OmniStudio USB are not powered by your computer’s USB bus. This means that the power supply included with these devices is required for operation.