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5v arduino regulator friend after installing jumper caps

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right after I set up the jumper caps under each motor driver and the extra fifth place for a motor driver, although I do not have a fifth motor (I am confident i put them in the right way), i fried the 5v regulator in the Arduino mega 2560 after connecting the 12V power supply, and i think it also ruined the RAMPS board. I think this because I purchased a new Arduino, downloaded the firmware, and after connecting it to the RAMPS board, it wont turn on. I think this is because i tried calibrating the voltage of each motor driver (via the trimpot) before putting on the jumper caps. Could that have been the reason that the 5v regulator burned? Thank you again for your help.

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    I have seen the 5V regulator blow if there's a direct short across the 5V. On a MEGA / RAMPS combination this is easily done if you connect the end stops to the wrong pins. On the RAMPS  there are three pins per end stop, +, - and S  and the microswitch should be connected between - and S but it is easy to make a mistake and connect to + and -.  So this or any other direct short on the 5V can blow the regulator.

    image

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    I have seen the 5V regulator blow if there's a direct short across the 5V. On a MEGA / RAMPS combination this is easily done if you connect the end stops to the wrong pins. On the RAMPS  there are three pins per end stop, +, - and S  and the microswitch should be connected between - and S but it is easy to make a mistake and connect to + and -.  So this or any other direct short on the 5V can blow the regulator.

    image

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