I've been having issues with my Arduino Ethernet kit I bought directly from GFR.
It's been working, however in the last week it has stopped completely - the LEDs no longer flash and the printer backend says it isn't detected.
So, I decided I might need to re-upload the sketch.
I get this error - the only thing I've changed is the MAC address.
Binary sketch size: 28,812 bytes (of a 32,256 byte maximum)
/Users/Javed/Downloads/Arduino.app/Contents/Resources/Java/hardware/tools/avr/bin/avrdude -C/Users/Javed/Downloads/Arduino.app/Contents/Resources/Java/hardware/tools/avr/etc/avrdude.conf -v -v -v -v -patmega328p -carduino -P/dev/tty.usbserial-FTAK1HR7 -b115200 -D -Uflash:w:/var/folders/h8/3gwff8m10x16lrb6_zqdg8nr0000gn/T/build4109678802743082864.tmp/sketch_apr16a.cpp.hex:i
avrdude: Version 5.11, compiled on Sep 2 2011 at 18:52:52
Copyright (c) 2007-2009 Joerg Wunsch
System wide configuration file is "/Users/Javed/Downloads/Arduino.app/Contents/Resources/Java/hardware/tools/avr/etc/avrdude.conf"
User configuration file is "/Users/Javed/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : /dev/tty.usbserial-FTAK1HR7
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: Send: 0 [30] [20]
avrdude: Send: 0 [30] [20]
avrdude: Send: 0 [30] [20]
avrdude: ser_recv(): programmer is not responding
avrdude: stk500_recv(): programmer is not responding
avrdude done. Thank you.