when i plug it up to power on the device the orange charging light comws on . when i push the power button it comes on for a second or two but doesnt engage the device to come on. power cord is good ans so is the jack and the power button. how do i trace it down and find the problem? ive been trying to get a schematic diagram but have had no luck so far .i apprec iate any help you can give me ..thanks ...john