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Basically i connect the 20 pin of the power supply to my motherboard and it works, but doesnt turn on, and when i connect the extra 4 pin then it wont turn on at all whats the problem please?

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This isn't a general PC Desktop question; and without a videocard, why would your system boot? Indeed, most won't run more than 2 seconds if they don't get a good fan tach reading for CPU and perhaps other fans. You need to describe what's unique about your situation and give the mobo model if you want to fix something that's not already set out in the appropriate PC and motherboard manuals.

Posted on Aug 02, 2008

Your motherboard must have blown or seized. If it's new, return it and tell them to test it, they should replace it.

if it's old, try connecting it to a differant pc, but if worst comes to worse, take it to a pc technician.

Posted on Jul 31, 2008

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Is this a new mother board or a new power supply? Some machines work with no 4 pin power, does everything work such as the fan

Posted on Jul 31, 2008

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1 Answer

Had to get a new power supply for my GT4016. When I got ready to hook up the motherboard power connector I realized the power supply has a 20 pin connector and the motherboard connector has 24 pins. Did...


on the part of the power supply there is another connection with 4 pins the 20 pin and the 4 pins click together then slot into motherboard thats usually wat the problem is theres AT and ATX motherboards see if you have those extra 4 pins hanging loose on the wires they slide into each other then into motherboard

Oct 09, 2011 | Gateway GT4016 Desktop PC

2 Answers

I am replacing a motherboard with a G31-M7 TE and find that my existing power supply has a 20 pin plug consistant with the old motherboard but the new one has a 24 pin socket. Why is this and do I need to...


New motherboards have a 24-pin power connector. Here is a diagram of both plugs:

pgh_pa_guy_3.jpg

You can see that the two are almost identical. The extra 4 pins on the 24-pin connector provide extra connection points for a few voltages. Newer boards and processors need more current, and the extra pins were added to prevent overloading.

Adapter cables are available to go from your 20-pin power supply plug to the 24-pin motherboard connector. Here's one from TigerDirect, and other vendors have them as well. If you're not making other changes than replacing the motherboard, you shouldn't need more than this adapter.

If you are upgrading your processor along with the motherboard, you should probably replace the power supply too. Older power supplies are often in the 300-watt range, and this is too low for reliable operation with new processors, motherboards and video cards. A new 500 or 600-watt supply is not expensive, and would give you the 24-pin power connection the motherboard needs.

Hope this has helped. Thanks for using Fixya!

Nov 20, 2010 | Biostar G31-M7 TE Motherboard

2 Answers

I've got a new Gigabyte Ga-M68Mt-D3 mobo paired with a cooler master 460 watt power supple. Cpu is Amd phenom II 3.2 ghz with 4 gig of DDR3 ram. I powered up the supply attached to my ATX power supply...


Most motherboards now have a 24-pin power supply connector. If you haven't already found a diagram showing the pinouts of the 20- and 24-pin power plugs, here's one borrowed from a handy site:

pgh_pa_guy_1.jpg

The two plugs are essentially the same, but the 24-pin version duplicates some voltages on the extra pins. The extra pins in the larger connector were meant to provide extra current paths for voltages that see heavy loads from newer processors and motherboard circuitry. Depending on how a motherboard is designed, it might work with a 20-pin plug connected (leaving pins 11, 12, 23 and 24 empty). But typically if the board has a 24-pin connector it needs the 24-pin power supply plug.

Most power supplies have a 20-pin plug with a separate 4-pin section that fastens to it for connection to a 24-pin mobo connector. It typically has one side designed to slide onto the end of the 20-pin plug, essentially turning it into the 24-pin version. This added plug does not have a retaining clamp on its side, so you can tell it from the the 4-pin CPU power plug. The wire colors are also different. For reference, here is the processor power plug, from the same website:

pgh_pa_guy_2.jpg
New motherboard specs call for the separate processor power connector for the same reason the extra pins were added to the power supply connector: to handle the high currents needed by increasingly faster CPUs.

When the motherboard has these connectors, you need to use them all to get everything working. Hope this helps. Thanks to smspowersupply.com for the diagrams, and thank you for using Fixya.

moz-screenshot-1.png

Nov 19, 2010 | Computers & Internet

3 Answers

Motherboard has a 24pin connector for the power supply, but the connector on the power supply has a 20 pin connect? How do I connect it correctly


i presume that is a pentium 4 or newer motherboard. you will need a power supply that has at least one or two of the small four pin connectors as well... generally if it has that the extra four pins slides onto the 20 pin connector on one side and that makes up your 24 pin connection.

Sep 10, 2009 | HP VECTRA VLI8 P3 Motherboard (KZM6120)

1 Answer

Can i use 24-pin power supply on a 20-pin motherboard?


You can, with no problem.

The 24 pin power supply has the extra 4 pins on a "tear off" type of deal on the power supply connector. You seperate it, and you can then put in the 20 pins, in the older style motherboard.

Apr 05, 2009 | Computers & Internet

2 Answers

Not sure about upgrading power supply


In many cases the additional 4 pin section slides up and off of the main power plug for use in your particular unit.

Feb 20, 2009 | HP COMPAQ Presario SR5410F Pentium...

1 Answer

Not sure about updated power supply


Gee. If HP recomends you not to hook up the extra four pins it must be because the four either go nowhere,which may cause a short or ground condition.Or that the extra pins will power something that will then  be in excess andd cause it too burn out. They know what will happen and for that rwason caution you not to do it. Of course it is you machine and  if you have extra money to replace things with go ahead and do it if you really want to know that badly.

Feb 20, 2009 | HP COMPAQ Presario SR5410F Pentium...

1 Answer

I change the power supply but i have a little problem. The new one on the ATX power connector have only 19 pin then 20 old one plus extra 4 pin for something else. The new power supply in Rosewill...


The extra 4 pins on the power supply's atx connector is for new motherboards that require 24pin power supplies. If your motherboard has a 20pin port, then only connect the 20pin portion of your power supply connector.

If your power supply has a 24pin fixed connector that can't be split into a 20+4pin configuration, and your motherboard doesn't have space to let the extra 4pins on the side, then you might want to consider returning the power supply and change it for one that can be used as a 20 or 24pin. Otherwise you will need to cut the extra 4pins apart.

Jan 05, 2009 | ASUS P4B533 Motherboard

1 Answer

Replacing a power supply.


Hi,

You need to connect both 20-pin and 4-pin connector to *********** board. Your 4-pin connector is located between your CPU and a I/O connectors.

If you did it right first time, check if you have anything shorted on your board because your old P/S could go bad for reason.

Good luck!!!

Jun 20, 2008 | EliteGroup K8M800-M2 Motherboard

4 Answers

Power Supply Question


hi you can buy a new 20 pin to 24 pin adaptor from ebay for a few pounds, or most new power supplys do have a 24 pin slot for your motherboard power let me know if you need anymore help regards steve,

Mar 18, 2007 | ASUS A8N32-SLI Deluxe Motherboard

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