DO NOT USE WD40! WD40 is a conductive and can destroy your keyboard if it gets on parts that run on micro-volt circuitry, which your keyboard does.

My on/off button is showing the same signs of wear and will be replaced by an authorized service center. It turns on normally, but it does not turn off properly anymore. This took a lot of years and daily use to happen. The cost will be about $100 and well worth it.

Good luck,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)