Arduino USB board

hai people,
I received my new arduino with atmega328 chip and it is having error please help me out.
i use mac os snow leopard
the error is when i try to upload a program it shows
avrdud stk500 programmer not responding

Have you set up the IDE? Have you made sure you have the correct port selected as well as what board you have?

yes man, where is device manager in mac

Did you select the serial port correctly? It’s usually some weird name, and usually first on the list.

Double check that you have the board selected correctly. It matters if you select 168 vs 328.

Try hitting the reset on the Arduino and try again

If that fails, try uploading the latest FTDI drivers.

You don’t need any device manager. It’s one of the above issues.