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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
Are you sure you've connected it exactly as it said on that SSD1606 page?
It's suggesting that you could connect the 3.3v power pin to A7 - so if that's the case then when you plug it in the Blue LED shouldn't be lit.
I'm sure you could power it directly with 3.3v, but I wonder if the code is expecting the display to be in a certain state after it's powered on, so doesn't cope well if the display is permanently powered?