Hi, I have a Mega 2560 and when ever I try to download a file it says "serial port 'COM3' not found". Whats my problem I have the right board selected and I think the right programmer. Thanks 1001100111100

COM3 error

system October 13, 2012, 9:25am 7

actually it seems to vary with what USB port i'm using how often this occurs.

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