arduino mega 2560 serial stuck

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hey....!
i using mega 2560, when connect 12v-1amp external power supply , can'nt access serial or not show serial port board.
please me...

do use dc jack plug 12v ?

there few possibilities:
1 ) board broken. perhaps voltage regulator blown reverse current. or have bad soldered clone ebay. or applied 12v accidently somewhere on arduino board.
2 ) voltage regulator reduces output if gets hot. if use arduino board power lot of things (like leds) voltage regulator might hot. higher input voltage, hotter gets.


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