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computer shutdown

By mojemo ·
i am trying to determine the source of my problem - when the computer is powered on, it immediately shuts off. what are some good ways to troubleshoot the source of the problem?

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by TheChas In reply to computer shutdown

If the PC shuts down before even starting the POST process, then there are 2 prime suspects:

1. The PC health status is reading either no CPU fan, or a bad CPU core voltage.
You might be able to get past this by clearing the CMOS for at least 1 boot.

2. The motherboard is NOT returning the power supply good signal to the power supply.
This could be from a motherboard problem, or a power supply problem.
Either swap in a known good power supply, or use a power supply test load to check the power supply.
A bad CPU can also cause this.

Chas

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by TheChas In reply to

Sorry for the double post.

I got an error message the first time I submitted the post.

Chas

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by TheChas In reply to computer shutdown

If the PC shuts down before even starting the POST process, then there are 2 prime suspects:

1. The PC health status is reading either no CPU fan, or a bad CPU core voltage.
You might be able to get past this by clearing the CMOS for at least 1 boot.

2. The motherboard is NOT returning the power supply good signal to the power supply.
This could be from a motherboard problem, or a power supply problem.
Either swap in a known good power supply, or use a power supply test load to check the power supply.
A bad CPU can also cause this.

Chas

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