This could be the result of a number of issues The USB cable is not connected to a USB connector on your computer properly. Disconnect the USB cable, and then reconnect it. Use the supplied USB cable. You cannot charge the battery when the icon appears. Charge the battery in an ambient temperature of 5 °C (41 °F) to 35 °C (95 °F). The computer is not on or may in sleep or hibernation mode. Counteract these settings. Connecting your Walkman via a USB hub may not work. Connect the Walkman to your computer using the USB cable (supplied). You have not used your Walkman for more than a year. Depending on the conditions under which your Walkman is used, the battery may have been deteriorated. Consult your nearest Sony dealer.
When the device is used for the first time or has not been used for a long period of time causing the battery to deplete, it may take up to 5 minutes before the device is responsive and starts to charge. On models with a screen, the screen may remain blank. If the portable player is not recognized or does not begin to charge after approximately 5 minutes, reset the unit.
There may be one or few issues causing this problem. Try using a different USB cable, or change the USB port that the device is connected to. Also,make sure that the correct operating system is installed on the computer, as the device may not work with certain operating systems. The Walkman is only compatible with Windows XP or newer. If the problem persists after these steps are taken, try to restart the device.