I recently ordered two new Arduino Unos. One was part of the Experimentation Kit, which I have been using with no problems and absolutely love. The other Arduino Uno was part of a Starter Pack which I gave to a friend as a birthday present. When he unpacked it and gave it a try he received the "avrdude: stk500_recv(): programmer is not responding" error when trying to load the Blink example sketch. He brought it to me and I tried to load a sample sketch using my setup (which works perfectly with my identical Arduino Uno). No luck. The L, tx, and rx LEDs show activity but I get exactly the same error message.
Nothing aside form the usb cable is connected to the board. I've tried the reset button before loading the sketch, and I've tried restarting my computer. Again, everything works flawlessly with one Uno, and the other one gives the error.
I'm running IDE 0021 on Ubuntu 10.10.
You guys are the experts. What is your assessment?