Arduino to PC serial communication

I have tried Serial.Println as well - My understanding was that Serial.print would do a new line and Serial.Println would do a new line with carriage return, or is a new line feed different?

Serial.print() adds nothing to your string.

Serial.println() adds a carriage return and a line feed.

Try:

Serial.print("START\r");

or

Serial.print("START\n");

to see which the software actually understands.