Have you tried connecting from a different computer, or just restarting your computer?
Sometimes the browser/bluetooth stack on the PC can get confused and will refuse to connect - it might not be the Puck at all
@Gordon started
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.
Have you tried connecting from a different computer, or just restarting your computer?
Sometimes the browser/bluetooth stack on the PC can get confused and will refuse to connect - it might not be the Puck at all