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Ultimately, how I ended up fixing my Oster 5965 and Hamilton Beach Cool Touch Electric 40898 kettles that had the same problems as you (Nothing would work; no heat, no buttons would light up) was by taking apart the bottom screws (Be warned, for only one screw I needed a "Spanner Insert Bit"). I jiggled the connectors as I rang them out with my multimeter and everything seemed to work. Leaving the bottom off I retested the kettle and it just worked. I reassembled the parts and made my happy wife a cup of English Tea.
Vinegar is very good at removing scaly deposits. Heat white/clear vinegar just as you would normally heat the water for your tea. After heating the vinegar, pour out and rinse thoroughly with water. If there are still deposits after this first attempt, use vinegar once again. Once you are satisfied that all the deposits have been removed, heat water in the tea pot 2-3 times to remove any smell or taste from the vinegar (before using for tea).