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Microsoft Help and SupportHardware devices are not working or are not detected in Windows Automatically diagnose and repair problems with devices when the device manager does not detect your hardware, audio, USB, or other devices, or when your devices are disabled or not working.
once only Media player grudgingly allowed me to transfer some Cds to the device
A bus-powered hub is a hub that draws all its power from the host computer's USB interface. It does not need a separate power connection. However, many devices require more power than this method can provide, and will not work in this type of hub.USB current (related to power) is allocated in units of 100 mA up to a maximum total of 500 mA per port. Therefore a compliant bus powered hub can have no more than four downstream ports and cannot offer more than four 100 mA units of current in total to downstream devices (since one unit is needed for the hub itself). If more units of current are required by a device than can be supplied by the port it is plugged into, the operating system usually reports this to the user.In contrast a self-powered hub is one that takes its power from an external power supply unit and can therefore provide full power (up to 500 mA) to every port. Many hubs can operate as either bus powered or self powered hubs.
Is the player fully charged when you plug it into the PC?
I forgot to mention that the usb ports on the computer are fine with other devices: camera, sat nav, and a (diferent) MP3 player.