Hello,
I loaded the example, hello world, and changed lcd.begin to both 20,4 and 4,20, same result. (I think it is supposed to be 20,4.)
I've wiggled every connection, pulled them out and put them back in. wiggling doesn't seem to do anything, which I think is good.
Is there a ctrl-alt-del for the lcd display? I feel like it need a good reboot to clear out previous uploads? I've done the upload, and then pulled the usb plug, and then reinserted the usb plug, for a power up of the display, no change.
Rich.