My first suggestion would be to check to make sure if the USB is securely connected to the blu-ray player. If it is, check to make sure the USB device is on. If it isn't coming on, this may mean the USB itself is damaged. Try using it on different devices to check to see it works on those devices. If that is the case, then the USB port might be not working correctly.
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My first suggestion would be to check to make sure if the USB is securely connected to the blu-ray player. If it is, check to make sure the USB device is on. If it isn't coming on, this may mean the USB itself is damaged.
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For further help, you could try checking out the [https://www.ifixit.com/Wiki/Sony_BDP-BX620_Troubleshooting|Troubleshooting Page].
My first suggestion would be to check to make sure if the USB is securely connected to the blu-ray player. If it is, check to make sure the USB device is on. If it isn't coming on, this may mean the USB itself is damaged. Try using it on different devices to check to see it works on those devices. If that is the case, then the USB port might be not working correctly.