Computer won't turn on

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Over the last 4 months the computer has, when the CPU temp reaches 111
degrees F., the computer has gone into a series of reboot ending with Win98
in safe mode.

I have replaced the CPU fan, the case fan, and added an exhaust fan.
However, the rebooting keeps happening, especially when running CPU
intensive applications.

Still, last Sunday when I went to turn on my 7-year-old computer nothing

No lights, sounds, groans, smoke. In short dead silence.

What could be the problem?

Did the power supply die? Or can the problem lay somewhere else in the

And is there a way to tell?

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