Dv-7 -4173us overheated fried cpu

ok i checked the thread on over heating, apparently i have a classic example.
laptop started showing heat problems about a year ago.
i set the fan to run constatly when i first statred using it which may have helped me not see the problem for some time.
it has always been on a cooling pad of one type or another. the one ive used for over a year has 2 fans and is an open wedge shape allowing good air flow.
when i noticed it getting hot i plugged in the external fans which seemed to work at least to some degree.
i did not have shutdown problems, it just failed to boot one morning (no video of any kind) giving me a blink code of 1 at the caplock key.
i turned it on the next morning and ran for about 2 days. it has not run since, i turn it on every day or so just to see what happens.
before i spring for a new cpu is there anything else i should be lookiong at? 
i removed and reseated the memory already.
fan appears to run correctly during startup, runs up to speed then backs down to idle.
will be doing a full cleaning and thermal compound replacement as part of the cpu replacement.
guess this is mostly a rant about the cooling problem.
Art

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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