Computer turns itself off after 2 seconds. Why?

I press the button to turn the computer on, and the button lights up. Nothing appears on the screen and after about 2 seconds, the computer turns itself off.

I have pulled the power cord out and in, hoping that would fix it, but nothing happened.

"It has Windows Vista for the operating system, if that’s any help.

Is there any way to turn the computer on in safe-mode? If so, I’ll do scans to hopefully fix the problem.

Any ideas?
Thanks"

This problem is most likely due to a faulty power supply. The power supply isn’t stable. Test by using a power supply from another computer, if you can, and replace your power supply with a good or new one.

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