Mac USB Ports Stopped Working? It’s Likely Easy to Fix. (USB, power, battery, fans, ports, etc), all of which can get mucked up, which is why resetting it works to resolve nearly all issues with power and hardware. USB hub issues (“USB Device Needs Power” alert when plugged in into the hub) can be fixed with. Powered USB hubs don't work Mac Hardware forum. About This Forum. I had a powered USB hub attached to my computer, w/ a mouse and two printers attached to it. For a while, it seemed to work. This dubious hub has apparently killed three Mac motherboards so far, so let's investigate what could have caused that. Note that it's worth removing the hub and attempting to reboot the Mac, since the presence of the hub may be stopping it from waking. First test was on the power supply with a PAT (Portable Appliance Test) doing an insulation test for a double insulated appliance between its input and output. Next test was to see if it might be backfeeding the computer when it was turned off. The USB standard has a lot of protection, but I don't think they envisaged power actually being applied to the computer from a USB port. This one is backfeeding! ![]() ![]() This is where an illuminated USB cable could actually show if a hub was backfeeding power out its input connection. If you enjoy this channel you can help support it with a dollar for coffee, cookies and USB compliant devices at. Hadoop learning app for mac.
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