Hi, I have had some problems with my newest board based on the ATmega2560. Trying to fix a issue I've had for a week I turned my suspicions to the external crystal which seemed to worked fine locking through the oscilloscope but I had nothing else to try so I switched to use the internal 8MHz clock. …

Set fuse to use internal clock - "target doesn't answer"

nickgammon March 25, 2013, 6:44am 7

If you have another board, try running the sketch below and seeing what response you get:

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