With power on but the USB cable disconnected my USB light on the unit stays unlit.
There is mention in the user guide of potential conflict if USB 1.1 devices are used concurrently...? I understood that a 1.1 device would drag the operationg level of a port down to that standard. Don't know if this is globally or by the port. Just a thought.
Let me know if there is anything else I can do.
cheers.
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