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I installed a new power supply when i push the power button yhe monitor comes on for 5 seconds and then goes black

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So could you please tell me what exactly was wrong with your previous power supply. I know it wud sound bad to you but sometimes faulty power supply causes permanent damage in your other hardware. So may be try to remove one hardware at a time and try to restart your PC without that hardware. If you would have same problem then install that hardware and try it with another one.
When you start your computer just start with basic hardware i mean only with keyboard, mouse , monitor and power supply.
But before anything please make sure your new power supply is giving right voltage and you have applied all connection. Some motheboard have special 4pin port for your CPU fan and for those motheboard you need a power supply with four pin wire only for ur CPU fan. Make sure your CPU fan is running. If not then you need that power supply
see these images
http://images.google.com/imgres?imgurl=http://www.playtool.com/pages/psuconnectors/12v4pinadapter.jpg&imgrefurl=http://www.playtool.com/pages/psuconnectors/connectors.html&h=365&w=355&sz=22&hl=en&start=1&um=1&usg=__smTu4Xc7VDpTb8XZI8Sm_Yv8AfA=&tbnid=p8hrXAAr7Uog9M:&tbnh=121&tbnw=118&prev=/images%3Fq%3Dpower%2Bsupply%2Bwith%2Bfour%2Bpins%26um%3D1%26hl%3Den%26rlz%3D1T4GFRC_en___CA204%26sa%3DN

If you are not sure please call any computer technician or take your power supply to him to check output voltage.

Good luck and hope it helps !!

Posted on Oct 01, 2008

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