Siren sound...does it continue AFTER cpu is fried?

Hi,  The expert help of this forum is appreciated!!
 A 4-year-old system using MSI 845 Ultra, Ver.1, has suddenly refused to boot.  Siren sound (high-low beeps in series, like a British cop car) ensues after fans start up, and continues...and continues...and continues.  It's actually my father-in-law's system, so I don't know for sure what preceded this condition.
I do know that when I arrived, I heard one case fan whirring overly loudly...it was a rear exhaust fan. Unknown how long this had been the condition.  But, the P-4 1.7 cpu's fan and front case fan work fine, as does the vid card fan (a Winfast G-force2, which shows good diagnostic lights all lit). All drives power on; power supply seems fine.
So still good general airflow, no cooking smells, no leaking motherboard items, all cards/connections seated well.  No outward changes or software changes to a locally-manufactured system that has run smoothly for 4 years of light use.
My reading here tells me the siren means cpu overheating.  The machine owner reports he heard the siren start and then he repeatedly cycled on and off to get the machine to boot, before giving up and calling me.
The first question for your help  --->  Would the siren continue if the cpu were already cooked??  The siren begins immediately even after machine not started for hours; it's not something that happens only after some period of use.  It goes off first time, everytime.
Any other ideas for diagnosis...or prognosis??  Does the ongoing siren mean the cpu is still suffering, or is it dead and ready for burial? Do you think that one bad exhaust fan could have caused the situation?  I mean, this guy doesn't overclock...he's email, internet and word processing all the way (though he does leave the system on all the time, allowing sleep mode to take care of the overnights).  On the other hand, am I way off?  Could this be something else besides an overheated, fried cpu?
Thanks very much for your help!

Thank you Maesus, Johnny and Heath...your help is very much appreciated. I am always, always amazed about how generous the PC-expert community is!  I am going to work today on that machine at the in-laws...will put your ideas to work.
If no-go, I will probably be back...and yes, I'll then put on full specs too. 
In the meantime, thanks again, and I'm outta here to go silence that really, really alarming siren (how DO they get such an annoyingly loud sound to come out of such an ittybitty speaker?).

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