[CentOS] Edit to change startup from SMP to not so SMP

I have an issue on a server that stops to ask SMP or not so SMP on bootup.
Its a pain as its a remote unit, and if I update (or the power goes out for
3 hours) the server will not restart....
 
I remember back in the day editing a start up file to tell it what kernel to
start...   Is that the file I am looking for to tell it to autostart smp???

 
Anyone have a 101 on how to do this?
 
Thanks,
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