New... computer power supply begins with 20pin but interrupts when 4 pin is connected

I read through many of these posts and they were very helpful. I'll try to make this short. I have a HP a1118x who gave me the flashing light feared on the power supply after a recent power outage. Rather than view this forum, I assumed that the PSU was wrong and ordered a new. 480 watt Logisys 20 + 4 pins. Put everything back together and it still won't turn. Then I found myself here all by searching for a solution. Following the advice on another post I disconnected, mother card power and plugged the 20pin record while holding down the power button. Yay, it worked... until I connected pin 4 directly behind the pin 20. Each cut off again thing. No power supply, no nothing. I plugged the video monitor in without the 4 pin and a computer but no video. I guess 4 pins may have something to do with the video. Any advice on what it takes to solve problems?

This page is available to the motherboard: http://support.hp.com/us-en/document/c00257657

If food had a connector 24 pin for the motherboard, it should also be a connector 4 separate pins that goes on the plug just behind the 20pin connector.  (do not part of the 20pin + 4pin connectors.   Universal power supply have a 4 pins that will separate from the main connector 20/24 pin to fit an old motherboard like yours) Possily got the two mixed up?   It is to power the CPU, separate from the Grill which is part of the main motherboard connector.   Either that or the CPU/motherboard has failed, too.

Tags: HP Desktops

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