Tomtom xxl 540 tm wont turn on - GPS

if the internal battery has gone completey flat, you will need to hook it up to a power supply. Make sure the connection terminals are clean. A pencil eraser is good for this. When you press the "ON" button, you will have to hold it for 5 seconds or more for it to start up again. Once the battery has been charged, a quick press and release of the button is all thet will be required if the internal battery has gone completey flat, you will need to hook it up to a power supply. Make sure the connection terminals are clean. A pencil eraser is good for this. When you press the "ON" button, you will have to hold it for 5 seconds or more for it to start up again. Once the battery has been charged, a quick press and release of the button is all thet will be required