Sony VGC-V620G Manual

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If applicable, check the USB device is switched on and using its own power supply. For example, if you are using a digital 
camera, check the battery is charged. If you are using a printer, check the power cable is connected properly to the AC outlet.

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Try using a different USB port on your computer. The driver could be installed to the specific port you used the first time you 
connected the device.

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Check the manual provided with the USB device. You may need to install software before you connect the device.

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Try connecting a simple, low-powered device such as a mouse to test that the port is working at all.

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USB hubs may prevent a device from working because of the distribution of power. We recommend you connect the device 
directly to your computer without a hub.