My imac is 2008 model.  It shuts down suddenly often by itself.   Any idea how to fix?

My imac is  2008 model  OS X (10.5.8) .  It shuts down suddenly often by itself.  And sometimes not able to restart.   Any idea how to fix?

I know exactly what you are going through. I am almost 100% sure it  has to be due to these other failures involving temperature. Mine is in this group. Here is a further discussion:
Re: 75% failure rate on 24" iMac hard drives?
created by John P. in iMac (Intel) - View the full discussion
As an anecdote, our 20" early 2008 iMac has been running fine since we bought it nearly three years ago. The AppleCare is up at the end of this month so unless Murphy's Law notices we expect another year or two out of it before we upgrade it. It's on probably 18-22hrs out of every day.
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