Im very new to Arduino and recently bought a redboard (https://www.sparkfun.com/products/12757). I used the board once yesterday it worked fine and I was able to do basic stuff like blinking LED using ports 8 and 9. However when I plugged it in today the board is repeating the blinking LED whenever I plug the LED in that I uploaded to it yesterday. The board is not detected by Windows any more, and does not show in the devices manager now, there is also no sound when I plug it in. When I try uploading a new sketch I get the following problem avrdude: stk500_getsync(): not in sync: resp=0x00. Any help would be greatly appreciated, thanks!