HP LaserJet 3300 Multifunction Printer series - USB light blinking green

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USB light blinking green

If the USB light is blinking green, it indicates that the print server has detected a good connection
to a valid USB device, but the print server does not support the device. For example, this would
happen if you connected a USB digital camera to the print server.

This is not a fault, but rather an incompatibility between the print server and the connected device.
The HP Jetdirect 310x print server supports only USB printers (including USB multifunction
printers and All-in-One devices). It does not support non-printer USB devices, nor does it support
USB cable extenders, USB-to-parallel converters, or USB hubs.