Hi, my Arduino Uno was working perfectly a few days ago but today when I tried using it, it just wouldn't upload the sketch. I disconnected every wire (except for the data transferring one) but it still doesn't work so we know that it is not because of my wiring. I have checked my selected board and port at least 10 times already and I know for sure that it is correct, so it is definitely not a wiring problem. Because my board is a clone board of the Arduino Uno, the loopback test does not work for me. I've looked through loads of websites and forum posts but most of them say that it is because they have selected the wrong port/board, they've had stuff connected to the rx and tx pins, but this is not the case for me at all. Please help. BTW this is my error message when uploading the bare minimum sketch:
Arduino: 1.8.19 (Mac OS X), Board: "Arduino Uno"
Sketch uses 444 bytes (1%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
Problem uploading to board. See https://support.arduino.cc/hc/en-us/sections/360003198300 for suggestions.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00
Problem uploading to board. See https://support.arduino.cc/hc/en-us/sections/360003198300 for suggestions.
THANKS!
Jay