Can't upload to Bluno Mega 2560

I have just recieved two Bluno Mega 2560's and am trying to upload an empty sketch (From Arduino IDE) to it, but i keep getting the following errors:
Error: timeout
Error: timeout
Error: timeout
Error: timeout
Error: timeout
Error: timeout
Error: timeout communicating with programmer
Error: stk500v2_getsync() failed; try -x delay=n with some n in [-80, 100]
Error: unable to open port COM3 for programmer wiring
Failed uploading: uploading error: exit status 1

This also happens if i try uploading standard sketches from the Arduino site. I have checked that the port works, which it does, and Arduino can detect the board as well.
Can anyone tell me why this happens?