I set down the CTX to dig a plug and when I picked it back up it had shut down. I hit the start button and did not get the familiar start up tones and the screen is stuck on the start screen - it just say Minelab and will not go past it. Only the power button is responsive. I switched battery packs, recharged the lithium battery (which had plenty of charge when it shut down), and left the unit with no battery pack connected for several hours. All with no luck. When connected to XChange the computer does not recognize the CTX. Anyone else had this problem or have any ideas how to solve? I hate the thought of having to send in as I am going to be attending Andy's boot camp next weekend and doubt if I could get the unit back in time for it. HELP,