Uno sending serial data becomes un-connectable to Serial Monitor

It worked; thank you.

I was shorting out the wrong pins; the correct pins aren't numbered, and I assumed they would start numbering at 0, like the labeled pins, so that means I expected they should have been labeled 0-5. Since there was no pin 6 in that block (according to my bad assumption), it couldn't possibly be the correct set, so I tried the other ones. D'oh!

Thank you very much