problem uploading the sketch

Hello, I have a problem with my arduino. whenever Im trying to upload a sketch to the board it sends this message:

avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x71 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x71 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x71 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x71 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x71 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x71 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x71 Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions. avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x71 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x71 avrdude: stk500_recv(): programmer is not responding avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x71

I saw few other people in this forum with the same problem, but they are not using arduino UNO and if they are using it, its to program Attiny and I dont even have Attiny. I do have Atmega and I am programming it on a breadboard, but I dont think this is the problem cuz I am uploading to a normal UNO board.

any ideas about whats going on?!

Arad.

This looks like :

-wrong board selected - wrong com port selected - missing driver - corrupted bootloader - duff cable

If its a bare 328 on a board then a schematic of YOUR setup would be handy to see.