Overheating CPU

I have a HP nx9600 with XPpro in which I've checked and cleaned motherboard,cpu, fans and heatsink. As far as I can tell by the time my cpu heats up enough to kick on my fans, it to late and the system shut down before the fans have enough time to cool it down. Also their's no temp or fan info in system BIOS and speedfan doesn't support this system. Thank you for any help to solve this issue can not afford to replace system.
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More about overheating
  1. How long has this been happening? Have you attempted to overclock any of your parts? What CPU do you have? Im going to need some info in order to determine the problem :)
  2. Is your case proberly cooled?
  3. Pentium 4 3.4 GHz,1 GB Ram and I've never overclocked it.
  4. Well if you can't get any readings what makes you think it's a temp issue ?
    Have you tried HWmonitor or Coretemp ?
  5. From what i've read, you have already determined that the fans and other essential parts are in working order. I'm going to go under the assumption that the thermal compound on your CPU is not functioning properly, which commonly happens over time. This should be an easy matter to fix, there should be info on the HP website of how to re-apply it. If you have any questions, I would be happy to help you out.

    Here: http://www.insidemylaptop.com/replacing-thermal-compound-in-hp-compaq-laptop/

    This article should really help you out. Thats not your exact laptop, but they are extremely similar.
    Though I'm quite sure that the problem is originating from the thermal compound, make sure to double check your fans and heatsink before undertaking the process of reapplying the paste. Try to find more information on your particular model, and if you can, gain visual access to your CPU, the paste should not be hard to identify.
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