I have this xxl 540 tm and it work for a total of 10 minute when I actually use it in my truck . I call customer service and the assistant ask I if the unit be charge ?? I explain it be plugged-in for almost 8 hour before I actually use it for a road trip . the green power light on the bottom of the unit be on , but the unit will not power on . customer Service tell I to hold the power button for 1-2 minute for a ` soft-reset ' ... we be now at 12 hour plug directly to my cpu , and still nothing . so much for TomTom ...