USB powerloss?

Question

I have a toshiba A200 VO1 only a few weeks old.  I also have a mobile broadband modem connected to the three network (HUAWEI model No. E220) works perfectly on 3 of my 4 USB ports but will not detect this device in my front lefthand side USB port.  Have tested this many times and found will only "not detect this device" in front left port.  This device does require some power to run as initial setup requires usb cable with power assist.  Strangely though this port will still run a standard optical mouse.  could this be a hardware fault or something else.  any ideas?