Difficulty connecting to SainSmart Mega 2560

Hi all,

I recently bought an Arduino Mega from SainSmart:

When I try to load any of the examples I get the "Serial port /dev/tty.usbmodem1d11 not found." message.

I have also tried working with an Arduino Mega 2560 from Arduino and it works perfectly. It easily finds the /dev/tty.usbmodem1d11 and loads the examples with no difficulty.

Any advice regarding working with this board would be much appreciated!