avrdude: stk500_getsync() resp=0x0c

Hello. I bought an Arduino like 10 days ago and I now have problems with uploading the code. Compilation only doesn't output an error, but when I upload, i get this:

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x0c
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x0c

My code is very simple - it's just a blink sketch copy-catted from the blink guide. While uploading, I also saw the RX LED flashed a couple of times for like 50 ms. Then it started to blink constantly. The TX LED didn't flash anytime.

does the led flash once when you reset your board?

if no you have to reflash the bootloader by an avrisp or something else.

if yes there is a problem with your Serial port.

Did you select correct board type?
Could you provide more detailed info: board type, IDE version and used command from log?

I would wait with bootloader upload for now.

The TX LED didn't flash anytime.

You can check the serial line easily with the "loop-back" test. Here on web is a guide.