I bought my board from website
I think you should be more specific about which website (did you mean this site?).
Anyway, from your log I can see that your UNO is communicating with the Mac, up to a certain point. It stops at the moment when it should send information about voltage and oscillator frequency. Unless other people experienced the same problem and knows of a solution, it is almost impossible to make a diagnosis without running test that require a certain experience (have you seen the loopback test? do you think you could do it?).
The only things I can suggest are small changes without touching the UNO:
- With the Arduino connected to the Mac (powered on), try press and release the reset button (near the USB port). You should see the orange LED near PIN 13 blink for a while, then stay on.
- Try using a different USB cable.
- If you can find another computer, try installing the Arduino software on it and see what happens with your UNO.
- Search the forum for issues with the drivers for 10.8.2 and how people dealt with them.
If you cannot resolve the problem you may consider asking for a replacement.