MBP does not boot - no startup chime

Hey folks,
a couple of days ago my MBP (2.16 Ghz, 2 GB RAM, 250GB HD, OSX 10.4.11) crashed. The screen froze and I turned it off using the power on/off button. Since then (at least that's when I realized it) it won't turn on any more when it's "hot". When I press the power on button the optical drive spins, fans turn on but the screen stays black and I can't hear the startup chime. No reactions at all - can't use keyboard shortcuts,.... - only chance is to turn it off again with the power button.
If I let it cool down for a couple of hours or use an external fan for this it starts up just if there wasn't anything at all.
Already repaired permissions, reset PRAM,...
To be a bit more precise what "hot" means: when I check istat pro or something and the CPU is over 40°C /105°F it won't turn on any more.
Has anyone of you experienced similar things?
I appreciate your help.

Hi!
I am in love with this MacBook Pro...
But for the last two weeks, starts to get frozen on a random. Then when trying to turn it on, nothing happens (just a tinny noice coming from the board). I went throught Apple Support website and I ended by reseting the Apple portable's System Manager Controler (SMC) which means removing adapter cord and battery, then holding the start button for 5 secs and then releasing it. Then I tryied again to start it up and worked fine. By now it still shuts down time to time but immediatly starts up again itself. Weird, isn't!
Thought has to be something with the termal sensors and the SMC perhaps!
Any suggestions?

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