What do you mean by shorting the isp header?
I accidentally touched the pins labeled ICSP with my pliers while it was on.
LED on or off...
In that sketch, the LED stayed off.
To make sure it wasn't something wrong with my computer/OS, I tried a different one. (This time, running windows).
Everything worked properly for a little while, but then it died again
(Sketches now cause random results)
I uploaded a sketch with lots of Serial output, but then I just saw the letter 'ÿ' being repeated over and over again on the serial monitor.