Cannot upload sketches to Iteaduino board anymore


I am using this Iteaduino (v.2.2) board: The board worked fine for a while but suddenly I am getting this error when trying to upload a sketch:

Sketch uses 466 bytes (1%) of program storage space. Maximum is 30,720 bytes. Global variables use 9 bytes (0%) of dynamic memory, leaving 2,039 bytes for local variables. Maximum is 2,048 bytes. avrdude: stk500_getsync(): not in sync: resp=0x00

On the board there is a red diod (D13) which is turned on sometimes when I power on the board. Does this indicate an error?

In the IDE "Arduino Nano" and the correct COM port are selected. I tried to re-install the FTDI driver, tested it on different PCs but without luck. I can upload sketches to other Arduino board (not of the same make) without problems.

Is there something else I can try or is the board probably dead?