Is it really worth the cost of a repair? Use the 'power connector' as your on/off switch by plugging it in or pulling the plug, or better yet attach the connector to a power strip that has an on/off switch and use the power strip button as your on/off. Much cheaper solution than spending money having someone open up the keyboard to fix the power switch and then breaking something else in the process. It's not like a computer running windows where you need an orderly "power down"; cutting the power with the power switch or from a power strip has the same impact.