On your old board, the most likely culprit is the voltage regulator. Try plugging your board into a computer and see if it starts up. If it does, you can fix the board by adding an external power converter module to supply the 5V to the board. If USB power does not work, for $15 USD or so, you can replace just the Mega board. There is now a simple, no compile way to flash the Ramps/Rambo/MiniRambo boards. See my post in this topic.
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