avrude: atk500_recv(): programmer is not responding

I have attempted to run several different servo sketches and keep getting the same error messages. The com port and Arduino UNO is set correctly under the tools menu. The blink sketch runs fine. Any help is appreciated!

avrude: atk500_recv(): programmer is not responding.

avrude: stk500_rcv(): programmer is not responding.

avrude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x49

tomed3210:
The com port and Arduino UNO is set correctly under the tools menu.

How do you know? Ever uploaded another sketch?

Open device manager and look for the Arduino. Does it have a ! next to it?