Fan comes on real high, puts itself to sleep
Sometimes it stays awake, most of the time keeps dropping to sleep...
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The first thing you should try is,
Reset the SMC on Mac desktop computers
Follow these steps for iMac, Mac mini, Mac Pro, and Xserve.
Shut down your Mac.
Unplug the power cord.
Wait 15 seconds.
Plug the power cord back in.
Wait five seconds, then press the power button to turn on your Mac.
For Intel-based Xserve computers that aren't responding, you can shut down locally or by using remote commands. You can also shut down by pressing and holding the power button for five seconds.
How to reset NVRAM
Shut down your Mac, then turn it on and immediately hold down these four keys together: Option, Command, P, and R. Keep holding the keys for about 20 seconds, during which your Mac might appear to restart. (If you have a Mac that plays a startup sound when you turn it on, you can release the keys after the second startup sound.)
OptionplusCommandplusPplusR
When your Mac finishes starting up, you might want to open System Preferences and adjust settings that have been reset, such as sound volume, display resolution, startup disk selection, or time zone.
Update after you try theses options
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Did you change the hard drive and then the fan issue start?
by mayer