Hi There, My Mega 2560 R3 was working fine up until yesterday, using a Wall Wart, a 12 volt car battery, and also from the USB connection (I wasn't using them all simultaneously though). I am using a Ramps 1.4 shield with it, and yesterday I was taking voltage readings from the end stop pins on the…

Mega 2560 won't power up from external power supplies...

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