Imac and Macbook  Pro reset parameters issue

Looking for advice please.
Both my Imac and Macbook pro have not resonded upon startup and I have had to reset the paramters on several occassions.
Can anyone advise why this may have happened.  Both computers less than 4 months old.
Thanks

Sometimes files get corrupt or lose their permissions this is normal part of most operating systems. When you lose permissions to a file it will not let you read or write to that file.  This can cause problems with your system because to do work on your system you need to have access to read and write to some files. 

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