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Windows 7: Changed PSU,when connected 24pin,no power


29 Jan 2013   #1

Windows 7 Ultimate SP1 64bit
 
 
Changed PSU,when connected 24pin,no power

Hey guys
I exchanged psu's in my computers due to cable needs,and i have replaced a 500w antec with a 500w northq (NQ-4775-500s), now,i tested the psu with a multimeter,and all is a-ok across the board, however,whenever i plug the psu into the motherboard (Gigabyte GA-H55-UD3H), 24pin and 4pin 12v atx nothing happens, no fans start spinning,no light on mb,nothing. I can get fans spinning and everything if i short out the power and ground on the 24pin connector,but when same is connected to mb,nothing happens.

Now,this motherboard worked absolutly fine with the antec psu. The antec had a 8pin 12v atx i needed on another pc,and this gigabyte mb only need a 4pin 12v atx,so it should be a perfect fit.

Anyone have any ideas? Other than the mb suddenly is fried or something

My System SpecsSystem Spec
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29 Jan 2013   #2

Windows 7 professional X64
 
 

Are you sure you wired the front panel connectors properly? Does your motherboard have a powerswitch?
Have you tried with the OLD psu again and see if the computer starts?
My System SpecsSystem Spec
29 Jan 2013   #3

Windows 7 Home Premium 64bit sp1
 
 

Quote   Quote: Originally Posted by Erick Aguilar View Post
Are you sure you wired the front panel connectors properly? Does your motherboard have a powerswitch?
Have you tried with the OLD psu again and see if the computer starts?

If he just pulled out the Psu the front panel pwr reset buttons should be in tact

are you sure your 8 or 4 pin connection is in tight on the MB sometimes those tend to be hard to lock in

double check all connections and switches and make sure your board is grounded that would make you also think you have to juice
My System SpecsSystem Spec
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29 Jan 2013   #4

Windows 7 Ultimate SP1 64bit
 
 

Everything is 100% connected correctly and firmly in place,i cant even get power shorting out the mb power switch connectors,it is as if no power gets through the 24 pin connector.
There is no light on the mb either,and the other psu is powering another system,so i havent tried putting it back in,although it shouldnt matter,as all my psu work fine,all connectors deliver the rated volts continuously,and that leaves the mainboard,cpu,ram.

Will the mb power on (mb light at least) if no cpu and ram is in it?
My System SpecsSystem Spec
29 Jan 2013   #5

Windows 7 professional X64
 
 

Quote   Quote: Originally Posted by Solarstarshines View Post
Quote   Quote: Originally Posted by Erick Aguilar View Post
Are you sure you wired the front panel connectors properly? Does your motherboard have a powerswitch?
Have you tried with the OLD psu again and see if the computer starts?

If he just pulled out the Psu the front panel pwr reset buttons should be in tact

are you sure your 8 or 4 pin connection is in tight on the MB sometimes those tend to be hard to lock in

double check all connections and switches and make sure your board is grounded that would make you also think you have to juice
Well some people like to clean the inside of their computer throughly when swapping components.
But then again it may be just be me
My System SpecsSystem Spec
29 Jan 2013   #6

Windows 7 professional X64
 
 

Quote   Quote: Originally Posted by Tsunamijhoe View Post
Everything is 100% connected correctly and firmly in place,i cant even get power shorting out the mb power switch connectors,it is as if no power gets through the 24 pin connector.
There is no light on the mb either,and the other psu is powering another system,so i havent tried putting it back in,although it shouldnt matter,as all my psu work fine,all connectors deliver the rated volts continuously,and that leaves the mainboard,cpu,ram.

Will the mb power on (mb light at least) if no cpu and ram is in it?
No, you need to have at least CPU and one stick of ram.

I recommended you to try the other PSU to check if it might be the motherboard.
My System SpecsSystem Spec
29 Jan 2013   #7

Windows 7 Home Premium 64 Bit
 
 

Have you checked the back of the psu for an off/on switch?

along with the 24pin,

there should be a 4-8 pin connector, usully top left of motherboard.
My System SpecsSystem Spec
29 Jan 2013   #8

Windows 7 Ultimate SP1 64bit
 
 

Quote   Quote: Originally Posted by braddersz View Post
Have you checked the back of the psu for an off/on switch?

along with the 24pin,

there should be a 4-8 pin connector, usully top left of motherboard.
Dude, please read posts before answering. Ofcourse both the 12v 4pin connector, and the 24pin are attached, as well as the power switch on the psu is on.

Please check my above post for addition to this conundrum
My System SpecsSystem Spec
29 Jan 2013   #9

Windows 7 Home Premium 64bit sp1
 
 

The Motherboard in question should atleast admit a beep of some sort when it has power
if there was no beep there is something wrong the connections are secure the next step he can try it in another rig

and see if he can get it started if not i would think the PSU doesn't have enough power and he needs to replace it with something that can
My System SpecsSystem Spec
29 Jan 2013   #10

Windows 8.1 Pro RTM x64
 
 

The first thing to do would be to check (and double check) all motherboard connectors, especially the front panel ones. Once you have ascertained that everything is as it should be, try again. If still no go, you can (as a last resort) momentarily bridge the appropriate terminals directly on the main ATX power connector. The terminals to bridge are PS_ON# (Green wire) and one of the COM (Black wire). See image below:

Name:  ATX POWER SUPPLY PINOUT.gif
Views: 3
Size:  20.1 KB


My System SpecsSystem Spec
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 Changed PSU,when connected 24pin,no power




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