Wired keyboard stops working

My wired keyboard stops working a lot of the time. Message saying can't find keyboard and trying to connect to wired keyboard (which I don't use). If I close down and switch off at mains for 10 minutes or so Mac finds keyboard when starts again. Any ideas how I can fix this?

Try resetting the NVRAM
About NVRAM and PRAM
Try another BK. Maybe a KB problem.
Try booting to Recovery and see if it works OK. Maybe a software problem with Yosemite
OS X: About OS X Recovery - Apple Support

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