Temperature-related startup failure in MBP C2D

My MBP C2D fails at startup when rebooting after normal use (means web surfing and playing music with iTunes) and temperatures in my MBP's CPU cores have been ~50C or more by Temperature Monitor.
At startup DVD-drive makes it's normal eject sound, but then nothing, screen stays black. There is no startup sound or gray screen. I need to shutdown computer, let it cool down and after that it will start again.
Hardware test doesn't find anything and reseting PMU, PRAM or SMC doesn't help.
Problem seems to be temperature-related. Solutions?
Macbook Pro   Mac OS X (10.4.8)  

Sorry for posting a not-so-helpful reply, but I think perhaps there is something wrong with the temperature sensor(s). The processor should shutdown only when the upper temperature threshold is exceeded. I suppose the hardware test cannot be run when the machine is still "hot"? I would call AppleCare...

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