I have a Emachine that I have replace the power supply and new hard drive and it turns on then shuts down or it won't power up at all.I am out of clues of could be the problem....Help

I have a Emachine that I have replace the power supply and new hard drive and it turns on then shuts down or it won't power up at all.I am out of clues of could be the problem....Help

ok, lets start with this ?,why did you replace the power supply !was it dying a slow death or did it just die ,if it was going bad over time it can sometimes damage a motherboard .

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