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Aug 27, 2015 2:36 PM in response to Ann8080by mario49,Hi Ann8080,
Thanks for using Apple Support Communities. Based on what you stated, it sounds like the USB is drawing too much power. I would recommend that you read this article, it may be able to help the issue.
Apple Computers and Displays: Powering peripherals through USB - Apple Support
Confirming power usage in System Profiler
Open System Profiler to find more information about peripheral power requirements, or contact the manufacturer of your peripheral. For the most accurate information about power usage, make sure your device is connected directly to your Apple computer or display before opening System Profiler.
Troubleshooting
If you have a peripheral (such as a hard drive, audio device, or camera) that is acting unexpectedly—such as not turning on or not being recognized by the computer—the peripheral may require more power than is available. If you have a USB peripheral or a chain of devices, such as a joystick plugged into a keyboard, which requires more than the available power try one of these options:
- Use a USB hub that comes with a power adapter.
- Check that the peripheral offers the ability to connect to more than one USB port at once.
- Find out if the peripheral comes with a power adapter.
- If you cannot confirm your device's use with a hub, connect the device directly to the Apple computer.
Cheers

