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Service mode(blue screen) help needed


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I have a f700bt and the unit powers on but there is no splash screen after 20 seconds the buttons go dim but the fan is still working...When i try to get into the service mode nothing happens on the screen but the buttons start to flash and then after a while they go dim..is there a reason i can not get into service mode i do everything correct holding the reset, eject, menu and map buttons. Thank you for any help

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