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When i plug in the 4 pin power expansion plug into my motherboard, the whole system shuts down. I have checked with 2 power supplies but same thing. What is wrong or gone wrong plz?

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  • A Womans Computer Man
    A Womans Computer Man May 11, 2010

    hmm..power expansion plug..can you be a bit more specific on where and what that plug is for?

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I agree with WeListen2You, more info.

What is odd to me is you seem to be plugging the 4 pin power into the motherboard while it is on?!?!?

Maybe it is just bad wording. Some setups do not need the plug, such as AMD does not need the P4 connector, only intel CPUs need it.

Help that helps.

G'luck

Posted on Oct 24, 2008

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Posted on Jan 02, 2017

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Desktop shut down in few seconds after getting display


Good day,
The problem you describe is probably due to a faulty power supply.
The four pin connector which you unplugged supplies power to the CPU, which means you will not be able to get a display with it plugged out, as there will be no power to your CPU.
The fact that the PC does not shut down when removing the 4 pin connector strengthens the evidence that your power supply is faulty. By removing the 4 pin connector you are reducing the power required from the power supply to the point where it is not 'overloaded' enough to switch off.
You can test this by plugging in the 4 pin CPU power connector, then unplugging something else, such as the DVD writer.
Then switch on your PC and see if it still shuts down.
If it remains on then the cause of your problem is definitely the power supply.
Replace the power supply and make sure it has a wattage rating of 400 watts or more. These power supplies are relatively cheap, and should be available at your local PC store for about $15.
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My Dell Dimension 3100 will not boot up after I had opened the side cover to clean the interior of dirt using a brush and a vacuum cleaner. The only light I get now is an amber light on the ON/OFF button...


The first thing that i would do, would be to unplug the power cable and network cable from the back of your computer.
let it sit for about 15 minutes.

plug power and network back in. Amber usually indicates a power fault condition, hopefully you will see green now when you try to turn it on, and also see the hidden diagnostics numbers lighting up as well. (the green numbers 1-4 right above where the power button is)

If not, then with the power and network cables unplugged, give all the power connections going to your motherboard a good look over for any that may appear to be not quite seated. Gently pushing down with finger and thumb with a top down pressure (not really hard, it doesnt take much to reseat these if they are loose.
There is a wide flat gray cable that carries all the connections from the front of your computer to *********** board. this is located very very close to the power supply. try gently pushing down on that to see if it was loose. if it was removed when you cleaned it, i would pull it out again and check for any bent pins in the connector on the motherboard.

Also checking your drive cables going to the motherboard, and again applying very gentle pressure, top down.

Reseating the memory may also help but this doesnt sound like a memory related problem.

plug power cord and network cable back in.
If still no boot,
unplug power cable and net cable. then one last thing to try is removing the CMOS battery, and letting your system sit for at least 6-8 hrs. there is a jumper method of doing this but unless you are familiar with setting a jumper i don't recommend it.

reinstall your CMOS battery, plug power cable and net cable back in.
Try to power up

If you still have the problem, much as i hate to say it there is a high risk that there was ESD (Electrostatic discharge, static electricity) that does destroy sensitive computer components.

If your vaccum has a plastic nozzle, even just a split second contact on the motherboard in the wrong spot is enough to do the damage. im only putting this in as a last resort, but ive seen this type of thing quite a few times. 
If this is the worst case scenario then it would require replacing the motherboard.
hopefully this helps, and if i have helped you please dont forget to rate

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Good day sir, let try to test first the power supply, Unplug the power cord, remove the 20 pin (24 pin for the late model) molex power connector from the motherboard, plug in the power cord, get a 2 to 4 inch jumper wire, short the green wire with any of the red or black wire on the molex 20 pin power plug, the result maybe the following:
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  2. you will see the fan turn for a few second then stops. you power supply is selective, and may require a different type of motherboard. Get a new one.
  3. you wont see the fan turn at all. get a new one.
If in case you are with #1. uinplug the power cord and remove all the expansion cards, data cables from the hard disk and cd drives. we are trying to isolate the problem. make sure that the only connected cables on the motherboard are as follows:
  1. 20 pin power cable.
  2. 4 pin 12 volt power cable (if applicable)
  3. speaker
  4. power switch
  5. power led
Test the pc once more. plug in the PC. If still the board wont power on. problem with your motherboard. Note:make sure your RAM is good. Hope this helps.

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1. Remove All External Devices
2. Check the Computer's Power LED
3. If the power LED has not changed unplug the Power Cable From the Computer Disconnect All Hard Drive Power and Data Cables and power on the computer. If still no go.
4. Remove All PCI, PCI-E, and AGP Expansion Cards .
5. Remove All Memory From the Computer
6. Reseat the ATX and 12-Volt Connections . The ATX connector will be a 4 pin square connector connecting to the motherboard from the power supply and the 12-Volt Connection would be the biggest connector with a lot of colored wires.
7. If still no go.
8. Disconnect the Power Connection to the Chassis Fan
9. If the light still flashes then it could be a power supply or motherboard failure. Try a good know power supply first and if that does not fix the problem it is the motherboard. Also check the back of the tower for 4 lights lables ABCD or 1234.
Rate if useful.

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Helo,

If the power supply from your friends old computer may not fave all of the correct plugs to power up your computer. You system needs 2 plugs going to the motherboard one with 20 pins and one with 4 pins. Besure you have the correct plugs. The second thing to check is recheck the friendss power supply in another machine. Last option is that when your power supply overheated and died that it damaged your motherboard and you may have to replace it too.

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you can also get a multimeter and check each individual connector on the 20/24 pin connector to motherboard.
check the psu docs for the correct voltages to each pin

If you smelled smoke then chances are that something may have gotten toasted.
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There should also be a brand - the nVidia just relates to the chipset that the board uses, but its OK, lets check the wiring first.  If we still have trouble I'll get you to double check for the brand name.
Lets just check that you have the following plugs in place:
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