Heating problem with Notebook Compaq nx 6110

Hello,
i have got HP nx 6110 been with me for almost 3 years. all is working very good however lately it gets over heated & turns off. I have no idea what should i with this problem. Anyone suffers from the same problem??
thanks for any help.
Dude.
Exact same problem happens to my Compaq.
I have no idea of the model but it's pretty old now.
After about an hour or so it turns extremely hot and slows down completely.
Then it turns off.

I have just used my laptop on an elevated surface to let it cool from underneath as well, until I got a new one. ;D
Use the general Computer topic anyway.