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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Is it possible that your saved code is doing something that is causing it not to respond? You could try power-cycling it with the button held down for ~5 seconds and then saved code won't be loaded.
Also, is GND connected up? Sometimes not connecting it can cause some weird issues like that.