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I am having a problem connecting my power supply to my motherboard i can plug in everything except the one connectors that require a connection to a part called PWR-LED

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Take a look at the picture below:
i am having a problem - 6b13a3a.jpg

If I am right, the Front Panel connector should look similar as shown above (it's an assumption since you didn't mention the Motherboard's name and version). Look at the front panel connector on the motherboard carefully, you'll see similar name/indicator as you are seeing on the above picture like Pled, Hdled etc... I hope the front panel connector has 9 pins, and remember, one should be left without any connection.

Simply you have to connect the two female Pwr-Led to the Pled+ and Pled-, and Power to Pwr and Gnd, the same sequence with hard disk led and Reset switch as Hdled+ and Hdled- and Gnd and Reset respectively.
If the front panel connectors on your motherboard has less than 9 pins, then I am sorry, I have no idea about it and I am afraid if it exists or not.

If you still have the problem, let me know.

Good luck.

Thanks for using FixYa.

Posted on Aug 01, 2010

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My desktop computer loses power when I plug the 4 prong power connector into the motherboard. I have tried a new power supply but it does the same thing


Maybe we need more information. The motherboard needs that connector. Is it disconnecting physically? Check the plastic clasp that hold it in place. Be sure the large ATX connector is connected properly. Unplug then plug it back in.
What do you mean by it loses power? Are the fans running when it is plugged in? Do the fans run when it is not plugged in? Try unplugging everything except your video card, CPU, RAM, and keyboard. Plug the ATX connectors in including the 4 prong one. If it still doesn't work check your capacitors. They are the cylinder looking cans soldered on the motherboard. Are they bulging or leaking? Might be time for a new motherboard. Good luck.

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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.

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Check ALL your USB ports.. If any of the USB ports have shorted contacts or if the 5v rails are shorted to ground, the power supply WILL NOT switch on.. Also, if any of the items connected to the board have a supply rail grounded, again the board will not allow boot up. Unplug everything from the board and the drive power connectors too, except the power connector to the board and the front panel switches and try to switch on, if it still will not boot, check and recheck the USB ports and all power connectors, if it does, switch off and plug another item in, then switch on again. When you get to the item which prevents the board from switching on, thats where your problem lies. Dont forget, plug things back in one at a time, including the power plugs to the drives and try and power up between each item, and dont forget to power down after each item has been checked..

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That model motherboard does not support on/off control of the power supply. Refer to the output diagram on the power supply, and there should be pins in the connector (not used on your board) that may refer to the on/off control. Those pins should be tied together. Then the PC will turn on via the main power switch, and will require a manual turn off when the display says its ok.

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did you plug everything back to the new power supply?? is your monitor data cable connected properly??
please check everything is properly seated (don't assume... spend 5 minutes checking everything again) and make sure you GROUND YOURSELF by at least touching the power supply first before touching any component inside your pc.. don't forget to unplug the power cord from the power outlet!

some motherboard may have not only 1 but to power connectors, check your motherboard manual to ensure you're plugging everything that you need to plug (no more or less.. just about everything that needs to be plugged.. depending your motherboard and cpu power requirements.

check your memory is seated properly.

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Katstu, Are any fans, hard drive or LEDs coming on at all, even briefly? If nothing try the following: -Check each screw, card, connector and component you installed to make sure nothings being shorted out or is improperly connected. Common occurrences are screws touching capacitor or other component leads. -Check the power connectors to make sure everything is connected correctly and that all the contacts are still mounted in the plastic connector correctly. -Check the output on your power supply and verify it?s rated for your motherboard. -Check the 110/220 voltage slide switch to ensure its on 110 (US). If the power supply has a rocker on/off switch make sure its in the on (1) position. -Make sure the motherboard is correctly grounded to the chassis per your instructions. Typically the mounting screws touch a grounding plane on the motherboard and in turn ground that to the chassis. If your using plastic mounting studs that might be a problem. -Verify the computer case power switch is working correctly. -Make this as basic a machine as possible: remove and add in cards (except primary video card), remove all USB components, reduce the size of your memory (RAM) and if you have multiple hard drives remove all except your boot drive. If you get this far your processor or motherboard may be defective, it happens on occasion. Let us know if you have any other questions and please don?t forget to rate this posting.

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