Loop Back Test Failed

didn't work I still get avrdude: stk500_getsync(): not in sync: resp=0x00 I am using a new Uno everything was working fine for a week now nothing?? Help

I tried your loop back method nothing still getting avrdude: stk500_getsync(): not in sync: resp=0x00 It is a new Uno worked great for a week now nothing HELP!! getting made I have been doing research into this problem for two days now

Never mind figured it out learning curve

@klichtenwald, PLEASE DO NOT CROSS-POST.