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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

This problem started when I notice the computer was on but I had a blank screen on the monitor so I had to shut the computer down using the power button. When I tried to reboot was not getting power. I noticed that the power unit would kick out with the 12 volt 4 prong power connector plugged into the motherboard....Thanks....Chuck

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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.

Posted on Feb 11, 2014

  • Electronics and Systems

    Try change the proccesor many times make it fail coment ?

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13thLegion
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SOURCE: HP Desktop power up problem

Bad ram probably, units do that all the time at my job. Most of the time, it is the power supply that does not have enough power to invest into all hardware that makes your pc. even if you had a 400watts power supply, the next time you are buying a power supply you should do some kind of upgrade. 600 watts or more. If you have a high end graphics card then you are indeed in need of a new power supply. also check your cpu, its fan, check if it still seated properly, if there still paste on top of it to hel cooling it down, and protect it from statics. if you added new hardware, remove them and keep checking if it is working. To do manual diags, you need to take the unit apart. I would start by removing rams first, and check ram one by one, then hdd, then disconnect other components until i find the actual part. I am sure it is your powersupply, worst case scenario is you mobo is gone.(but it powers up and shutdown after all so let us hope you don't have a dead motherboard." and remove the dust please, dusty units do not run properly. Neim Le Legionaire.

Posted on Oct 19, 2008

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SOURCE: start button flashes yellow - will not turn on

I have found that if the CMOS battery is removed and the unit unpluged for 5 mins (reseting the unit to default config) It will restart. The battery should not be replaced thus to maintain your date and time settings, it shoud not be unpluged for long periods.

Posted on May 20, 2009

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SOURCE: 920-fan command 2 pin connector from power supply not connected

then connect the fan to a 2-pin connecter if you cant do it take it to a computer place to do it for you

Posted on Sep 24, 2009

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Hey i resently got an (HP Envy H8-1414) And baught


You need to check the color, and order of the wires on all the connectors to make sure you don't short something out. Just because it fits doesn't mean it has the same configuration or voltage as the old power supply. This is especially true of the motherboard connector.

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I need the wiring diagram that shows where on the motherboard to plug the power switch ,power LED, and HDD Led on a T6520 emachine desktop


Most Motherboards are made to only accept certain plugs in that specific spot! If you are trying to add something new like a new Fan or LED, or HHD and you need power you would have to use a 4 prong plug off the power supply, If your power supply does not have any more available plugs, Amazon.com or Newegg.com sells splitters!

Good Luck and Best Wishes!

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Replacing power supply to hp pavillion a810n and don't know how to connect all the wires. we bought dynex 400 watt power supply.


The secret: all the wires are oriented (you cannot plug the in backward), and your replacement
power supply must have a connector for each of your peripherals.
Even the connector going to the motherboard is oriented.
Make sure everything on this list has a power connector plugged into it, then
power up the desktop system and compute.

1. motherboard
NOTE: everything below in the list resides in a peripheral bay
2. HDD (hard disk drive) (there may be several)
3. FDD (floppy disk drive)
4. CD-ROM
5. DVD-ROM

If you run out of connectors, buy a "Y-connector" at your local "Computer Goodies" store.
As you connect these devices try to utilize proper anti-statis techniques - meaning, if you don't have an anti-static strap to clip onto the Pavilion A810N frame, then be sure to ground yourself
by touching the frame with a forearm or something as you make/unmake the power connections,
while at the same time try to avoid touching the (CMOS-based) IC chips or PC board surfaces.
forearm
External drives (incl tape drives) get their own power - not from your 400W Dynex.
Your computer monitor will also gets its own power (from a 120VAC 3-prong CEE cord)

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Install power supply


Relative easy. Open up the case and be careful to see what wires are connect. Replace each one carefully. There is the big wire that containes a bundle. This goes to the motherboard. There is only one way to install it. There is a 4 prong molex wire that goes to the hard drive. There are extra wires just in case you need to add another hard drive for example. There shoudl be 4 screws holding the power supply in place. Remove them from the back of the PC

May 07, 2010 | HP Media Center M370N (DM163A#ABA) PC...

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I am looking for a wiring diagram for my emachine front power switch


Power Supply Types

There are two basic types of power supplies. There are AT power supplies, which are older and in older computers, and ATX power supplies, which you will find in virtually every new computer you can buy.

There are two fundamental differences between AT and ATX power supplies. First, the switch mechanism is different. AT power supplies use a normal on-off switch, which directly turns the power supply on or off.

ATX power supplies use a momentary switch which does not directly control the power. Instead, the switch signals the motherboard, which performs one of three actions:

  • If the computer is off, the power supply is turned on (which turns the computer on)
  • If the computer is on, the computer goes into power-saving mode (standby)
  • If the switch is held for more than 4 seconds, the power is cut and the computer turns off.
Because of this difference, ATX power supplies are better for projects that require the second power supply to turn on automatically when the computer is turned on.

The second difference is in the motherboard connector: AT power supplies provide two 6-pin connectors (figure 1), which are easy to insert backwards. The ATX connector is a single 20-pin connector that only plugs in one way (figure 2).
2psfig1small.jpg 2psfig2small.jpg
Figures 1 and 2: The difference between AT (left) and ATX (right) motherboard connectors.
Both power supplies provide two types connectors for plugging devices into. These connectors are called Molex connectors, and they come in two sizes (see figure 3 and 4). A power supply will generally have a few of each size.
2psfig3small.jpg 2psfig4small.jpg
Figures 3 and 4: Large (left) and small (right) Molex connectors.
There is no difference between the two sizes other than the size itself. Both sizes provide the same amount of power to whatever device is plugged into it (12V and 5V). The small Molex connectors are generally used only for floppy drives. Large Molex connectors power hard drives, CD/DVD drives, and many fans and lights as well.

Note: You can purchase large and small Y-adapters if you run out of Molex connectors. Be careful when using the Y-adapters however, because if your power supply does not have enough power for all the devices attached (especially true for older, lower-wattage supplies), you can damage it.

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Needing to plug new power source to motherboard, need the diagram format


the easyest way to do it is to open up the side panel of the computer rite down the info off the side of the power supply such as voltage and so on then go out and buy the same type then as you pull out a plug from the one in your computer put in the same plug from the one you bought and you should be rite, theres nothing that technical you need to no just disconnect it from the power and pull out the plugs its that easy

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Sounds like the switch is out to me or it is mis connected to the motherboard

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The main connector to the power supply has to go into the motherboard. Its a rectangle shapped male connector that is on the end of the power supply that plugs into a rectangle female shaped connector on the motherboard. There might also be a shorter square male 4 pin connector at the end of the power supply that should connect into a 4 pin female connector on the motherboard.

After this then you'll want to plug the other connectors into any cd-rom, dvd-rom drives you may have. Same for a floppy drive if you have one. Also make sure your hard drive is hooked up. The connectors that you plug to these devices can only go in one way so no worries about hooking it up improperly. Hope this helps.

After all this, turn on the computer and then after you boot up into windows, make sure you go into my computer and verify that all your drives are being shown in there.

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Hi. NO, *********** board is not fried. I am not sure what the problem is but I do know how to fix it. It is usually casued by power outages (even if you have UPS supply).

1. TAKE OUT THE ELECTRICITY LEAD TO THE COMPUTER. Look inside the computer and find the bunch of wires coming from the power supply unit (the box thing at the top with the fan and all those colouted wires!).

2. Find where these wires run into a plastic connector and plug into the mother board. Unplug it.

3. Now plug the electicity lead back into the computer. The light should now stay ON.

4. Plug in the connector again... and boot up. Leave it run a while to convince it!

5. Repeat this process if it does not work first time.

This should fix your problem . It works for me when I get this problem.

Friend in Spain

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