Not possible upload sketches to my newly procured Arduino UNO R3

Using Arduino IDE 1.x
1

Hi Sir,

I purchased an Arduino UNO R3 which was tested in shop’s PC in front of me by uploading a “blink sketch” (to blink inbuilt LED at A13 )which was ok. But when I changed the delay from 1000 to 100 in my PC and tried to upload from My PC (windows 7, Board selected is “Arduino/Genuino Uno” COM1 port) I am getting following error messages (in orange color) at screen bottom after a lot of delay:

“avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xa3”

Please advice me how to correct this problem.
Kindly reply at the earliest please.
Warm Regards,
N.S SUBRAMANYA,

2

Try the Loopback Test at the top of this forum. You may just need to install/update the driver for the USB/Serial interface chip on your board. COM1 is not usually available for USB ports.

3

Thank you very much for the advice. Uploading is working now . But I found one more problem. Serial monitor does not display any thing( though corresponding code is avilable in the sketch). And its baud rates are not showing in its Serial monitor's baud rate selection combo.
Request suggestion.