My computer will not recognize my Arduino Mega when I connect it using USB. It's not my computer because other Arduinos work fine. Any clue what might be wrong?
[u]Detailed Description[/u] I'm working on a robotics project powered by a computer PSU, with one of the 12V wires connecting to the Arduino through a barrel jack adapter. Everything was fine for a while but all of a sudden I noticed that the power light on the Ardunio was flickering. I unplugged the barrel jack and now if I try to power the Arduino from the PSU the power light starts blinking rapidly.
I think the problem might be with the regulator because when I connected it to USB the power light would turn on then fade out after a few seconds. Now the power light stays on but the board will not appear in my list of available Serial ports in the Arduino IDE. Also, I'm not sure this is relevant but the LED connected to pin 13 comes on when I connect to the board, even though the sketch that was on the Arduino when the problem started did not use pin 13 in any way.
I have quite a bit of experience fixing electronics so if anyone can figure out which component is broken I would very much prefer to replace a single part rather than the entire board.