I was normally using my Arduino for small projects and samples.
When I tried to connect again my arduino on the computer yesterday, the Arduino IDE wouldn't recognise the usb connection and I couldn't upload any program on the board.
I tested the board on both Windows and Mac. The same problem occurs.
On the Mac, the only available serial ports when I connect the Arduino are:
The IDE automatically chose the /dev/tty.Bluetooth-PDA-Sync port since the USB is not available.
On the Windows, the COM1 port is available and selected.
When I try to upload the program on the board I get the following error on Mac:
"avrdude: stk500_recv(): programmer is not responding"
"avrdude: stk500_getsync(): not in sync: resp=0x00"
I used it mostly on a 9V charger and one time by accident I connected the USB at the same time when the charger was also connected.
Why is this happening since I could use the Arduino some days ago? Is there a hardware fault?