5 Replies Latest reply: Oct 6, 2012 9:11 PM by roam
padlady Level 1 (0 points)

Until recently I was able to plug in 4-5 USB Devices  by using a powered hub. However, recently when I plugged in more than 2 usb devices, the computer gives me a message that states that some of my USB devices may not work as they are using too much power. I have not changed anything else on computer, by way of upgrades, so I have not idea what caused this problem. I need to be able to plug in at least 4 usb devices. I am using an Apple I-Mac running OS X 10.7. Any help would be appreciated.

  • roam Level 6 (13,565 points)

    At a guess I'd say the USB hub has a power failure, i.e, it is no longer powering the USBs that plug into it. That computer message is the same as if the hub did not exist. You might need to buy a new USB hub.

  • padlady Level 1 (0 points)

    I bought a new usb hub and got the same message telling me that certain usb devices took too much power and therefore they were disabled. I had to disconnect all but 2 usb devices. It will not allow more than 2 devces whether I plug them directly into the computer or use a usb hub.

  • roam Level 6 (13,565 points)

    The only other thing I can suggest is to shut down the computer and physically unplug it from the wall, and wait five minutes. That will reset the USB ports and hopefully allow your powered hub to operate properly again.

  • padlady Level 1 (0 points)

    I tried and unfortunately that did not help either.

  • roam Level 6 (13,565 points)

    The next thing I'd try would be a different cable. In case you have not seen this troubleshooting list, here is the link.  Try out all the suggestions.

    USB and FireWire Quick Assist