Mac keeps going dead

Yesterday,i switched on my mac and withing a minute it had gone dead.it loads up,and after about thirty seconds there's a slight click then it goes dead.any ideas?
I installed a new power supply just two weeks ago

Well,
Based on what you said I would guess a bad power supply but you just replaced it. Have you checked the connections?
I once had a cable to the monitor that was bad(it was shorting internally from being kinked between a wall and the back of the monitor) and would do what you said but.....

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Well,
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I once had a cable to the monitor that was bad(it was shorting internally from being kinked between a wall and the back of the monitor) and would do what you said but.....

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