Truegrip:
i have the same Problems: ATmega 168 with a MacOX 10.6.8
No, you don't have the same problem. The due doesn't haven't an atmega168.
You likely have a board at uses a FTDI chip and so you need to install FTDI drivers.
Truegrip:
PWR light is green 13 red is blinking...
Red... So it isn't an Arduino.