TITLE
    USB: Troubleshooting Error Messages
Article ID:
Created:
Modified: 		43023
7/30/98
11/8/00
TOPIC

    This article documents USB device error messages that you might see on your USB equipped Apple computer.

DISCUSSION

    If you encounter any difficulties with USB devices, they are generally easily resolved. Basically, there are three kinds of error messages or dialog boxes the Mac OS may use to alert you to a USB issue. These include:
    • Not Enough Power to Function
    • Not Enough Power for All Functions
    • The USB driver needs to be updated. Would you like to search for the update on the internet?
    • No Driver Found

    Not Enough Power to Function
    The Mac OS will generate a "Not Enough Power to Function" message if
    • A device attempts to draw too much power from the USB bus
    • One or more devices plugged into a hub requires more power than is available
    • You have attached a self-powered device (like a printer or floppy drive) and forgot to plug it into an electrical outlet

    Solution:
    If you're using a self-powered device, check to see if the device is plugged into an electrical outlet. If not, try connecting the device directly to your computer or to a port on a self-powered hub. If you're connecting the USB device to a self-powered hub, make sure the hub is plugged into an electrical outlet.


    Not Enough Power For All Functions
    The Mac OS will generate a "Not Enough Power for All Functions" message if there is enough power to supply some but not all of the functionality the device is designed to provide.

    Solution:
    As above, you'll need to see if the USB device has its own power cord and, if it does, you'll need to plug it into an electrical outlet. Also, try plugging the cable for the USB device directly into to your computer or to an available port on a self-powered hub. If you're connecting the USB device to a self-powered hub, make sure the hub is plugged into an electrical outlet.

    The USB driver needs to be updated. Would you like to search for the update on the internet?
    The Mac OS will generate this error message if it detects an older driver.

    Solution:
    You can elect to download the driver from the Internet if you have a connection.

    No Driver Found
    The Mac OS will generate a "No Driver Found" message if a driver for the USB device is not found in the System Folder.

    If you get this message, you might have forgotten to install the device driver, or you may have put the device driver in the wrong place in your System Folder, or it may have been disabled using the Extensions Manager control panel.

    Solution:
    Reinstall the software driver that came with the product, check the Extensions Manager control panel to see if it is disabled, or download and install the driver from the product vendor's Web site.

    (This article is also included in article 30653: " USB FAQ (4 of 4) "

    Other USB FAQs can be found in the following articles:

Document Information
Product Area: iMac
Category: USB
Sub Category: Troubleshooting

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