Hello, I've bought my arduino uno last month and it was so good. Yesterday while i was loading my program on the Arduino uno appeared this message:avrdude: stk500_recv(): programmer is not responding. I checked that in the tools i chose the right type of arduino, and it was ok. The problem is that the usb modem ports are disappeared. I tried with a new arduino and it was all ok. I was working on a mac with OSX 10.9.1 Mavericks. I tried to load the program on the arduino from a W7 computer, but it didn't recognize at all the arduino and when i tried to load the same and late a different program appeared this message: stk500_getsync(): not in sync: reap=0x00.
i hope you'll help me!!
Thomas Civiero from Italy