We have 7 of your 7-port usb 3.0 hubs in use and purchased a spare also. Today we tried to use the spare and found that the power brick is not working. I measured the voltage of the power cable and it was 118 VAC but no voltage from the 5 VDC end.
Thanks for posting your question here! Sorry to know that the power brick enclosed in the package with the Plugable 7 Port USB 3.0 hub is not working. I apologize for the frustration caused by it!
If you could shoot us an email at firstname.lastname@example.org with your amazon order ID and a link to this thread, we will take care of the issue.