imac wont shut down properly. it turns itself on with trackpad error, unpaired???? This happened after upgrade in December or January 2018

imac wont shut down properly. it turns itself on with trackpad error, unpaired???? This happened after upgrade in December or January 2018
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Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time. You may need to do this 2-3 times.

                                

Reset NVRAM/PRAM

 

Try a SMC reset. The article covers when this is required, but doing this will not affect anything.

 

Reset SMC

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