Hello,
Something wrong went USBTinyISP and messed up with my UNO board..
When I power the board NONE of the L, TX, RX LED blinks, only the ON LED stays ON; if I try to upload a sketch only the L and RX LED blinks, TX stays OFF and I get the error "avrdude: stk500_recv(): programmer is not responding".
If I change the uc to other one with the sketch blink, the sketch runs and L blinks; if I try to upload another sketch to the new chip I got the same behavior has before.. only L and RX blinks.
I updated the serial to USB using the DFU mode without errors.. but the problem isn't fixed. What can cause such behavior ? Thanks.
Maybe the fuses are messed up ?