Arduino UNO avrdude: stk500_getsync(): not in sync: resp=0x30

Development Tools IDE 1.x
1

I've got a problem to upload any sketches to my Arduino UNO R3.

Everytime I try to upload it says: "avrdude: stk500_getsync(): not in sync: resp=0x30"

It worked 2 days ago and suddenly this message is shown.

I'm using windows 7 64bit.
The COM-Port Settings in the Arduino IDE is correct and I can see the Arduino in my device manager with the correct COM-Port.
I already tried my laptop and istalled the IDE on it - but sadly the same error message is shown.

Any ideas how I can solve this problem? Or is my Arduino (8 weeks after I bought it) already broken?
Thanks and Regards!

2

I have the same issue, same kind of computer OS. it only happens when I have a shield installed or a bluetooth connected to rx tx.

do you run a sketch with serial port on RX TX pins ?

3

No i just have the USB cable pluged in.
No pins connected or any shields...

That is weird

4

Would it be possible to bring my Arduino back alive with a second one if I do something like this:
http://arduino.cc/en/Tutorial/ArduinoISP?

5

I have a bluetooth module connected to rx and tx.