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My computer wont turn on when i plug the 2x2 connector into the motherboard

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Double check every conection in the computer

Posted on Sep 17, 2009

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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.

Feb 10, 2014 | Computers & Internet

1 Answer

Fix wireing on p6610f

This solution will be long in length. Therefore a lot of reading.
In essence I am typing out a motherboard manual, of a sort.

May look complicated. This is because I get very detailed.
If there is ANY area I have explained, that you do not fully understand, please post back in a Comment.

I will try to break it down, and/or use a different method of explaining.

1) Let's start with power cables from Power Supply, to motherboard;

HP Support > Pavilion p6610f Desktop PC > Main Support page,

Product information > Product specifications > Motherboard Specifications, N-Alvorix-RS880-uATX (Alvorix),

Looking at the photo of the motherboard, it is 90 degrees to the LEFT; in comparison to how it actually is mounted in your computer case.
(BTX form factor motherboard, and computer case)

I would also like you to scroll down, towards the bottom of the page; and look at the illustration of the motherboard.
(Motherboard Layout)

This way we can compare the two together, as I guide you.

A) At the bottom of the motherboard is the connector, for the 24-pin ATX main power cable.

Yellow/White in color, 24 socket holes. (2 rows of 12)

This is a General example of said power cable, and respective connector on motherboard;

[Note* Color of power cable connector, and motherboard connector; does NOT matter ]

In relationship to how it actually sits on the motherboard, while mounted in Your computer case; you will find it all the way to the LEFT.

Note the Lock Clip on the power cable's connector.
Has a hooked end that goes over a TAB, on the motherboard connector.
When deemed to be plugged in tightly, and correctly; the hooked end will be Over the Tab.

Operates on the same principle as a see-saw on a playground.
Squeeze the top in, to release when disconnecting.

B) 4-pin ATX +12 Volt power cable.

Yellow/White 4-socket hole connector. In the photo, above the processor socket, and to the Right of the square Aluminum finned Heatsink.

You will find it to the Right of the processor, and Below the aluminum finned Heatsink; motherboard mounted in computer case.

General example of said power cable, and respective motherboard connector,

Note Lock and Tab design, just like the 24-pin ATX main power cable.
Power for the Processor (CPU)
PU521 on Motherboard Layout.

That's it for power cables TO motherboard.

2) The front of your computer is the Front Panel.

Header; Rectangular small piece of plastic, that has contact pins sticking up.
You have 3 Black headers on the motherboard, a Yellow header (1), and 2 White headers.
This will become more self-explanatory, as we go on ]

To the Left of the 24-pin ATX main power cable's, motherboard connector; and to the Left of the ram memory slots; are three Black headers. (Photo)

(Mounted in computer case, To the Left/Top of motherboard)

The Orange connector you see to the left of the ram memory slots, is a SATA connector.
Looking at the Motherboard Layout, you will see it is SATA4.

To the Immediate RIGHT of it, is the Front Panel header.

The area of contact pins on the motherboard, that the Main wires from the Front Panel go to; is the Front Panel header.

Main wires such as Power On switch, Power On LED light, Harddrive activity LED light; and Reset switch.

On the Motherboard Layout, it is marked as J18.
You should have a cable coming from the Front Panel, whose plug on connector; matches this header.

Has 9 socket holes. 5 on one side, 4 on the other.
The missing pin in the corner, on the Front Panel header on motherboard; shows you which way the cable's plug connector, goes.

3) I do not know sir, what the long black header is to the left, of the Orange SATA4 connector, is. It is P17.
However looking at the length, you should find only ONE cable, and plug on connector; that matches it.

Should come from Front Panel. (IF it is used)

4) I do not know what the black header is, below J18.
(Again, J18 is the Front Panel header)
I believe with process of elimination, that the cable that goes to this header, will become readily apparent. (IF it is used)

5) There are Four SATA connectors on the motherboard.
SATA1 = Dark Blue
SATA2 = White
SATA3 = Light Blue
SATA4 = Orange
(Photo. Also compare in Motherboard Layout)

This is where a SATA data cable plugs in.
Your harddrive is a SATA unit. Your optical drive (CD/DVD drive) is a SATA unit.

The Harddrive plugs into SATA1.
The optical drive plugs into SATA2.
Any additional SATA units will plug into SATA3, or SATA4.
Example; A second SATA optical drive.

This is a general example of a SATA data cable, and SATA data connector on motherboard,

Note the SATA data cable connector. Has an L-shaped opening.
When connecting the SATA data cable to Harddrive, or optical drive;

Turn this L to the Left, and upside down. The 'foot' of the L always points DOWN.

Note the SATA data connector example shown. This is an OPEN design. Your SATA data cable connectors on motherboard, are a CLOSED design. Still has L-shape on motherboard connector, though.

The SATA data cable connector that goes to the Harddrive, and optical drive; is usually a 90 degree bent elbow.
NOT always though.
The SATA data cable connector that goes TO the motherboard, is a Straight connector.

Between a SATA data cable connector, and a SATA power cable connector; a SATA data cable connector is Shorter in width.
SATA data cable connector has 7-pins.
SATA power cable has 15-pins,

Same L-shaped interface is used.

Most of the time there is a Lock, on the SATA power cable connector. May be a Tab that sticks up, or a small lever, or a rubber 'bulb'. Depress with thumb to connect, or disconnect.

USB headers on motherboard, and USB connectors on motherboard.

Continued in added Comment.

Mar 23, 2013 | HEWLETT-PACKARD Hewlett Packard Pavilion...

2 Answers

Need wiring diagram for a hp m7680n

The good thing about the power connectors is they only fit where are supposed to fit. Either they do or the don't. There may be only three that are special. A 24 pin motherboard, a 4 (2x2) or 8 pin supplementary, and a flat 4 pin for a floppy drive. The rest are for SATA drives and the numbers really don't matter. Plus spares for possible expansion.

This is the manual.

Oct 13, 2012 | HP Pavilion Media Center TV m7680n PC PC...

1 Answer

Ya where do you plug the fan into this thing it fell out and now the computer wont work

The Processor fan?

Plugs into the white header on the motherboard, at the end of the Ram Memory slots. (CPU_Fan 1)
Right next to the edge of the motherboard.

{Connector on a motherboard is a Header}

Computer case fan? Plugs into the small red-ish header close to the Processor.

{Looking at the motherboard; Processor at the top, Ram Memory slots to the right. At the bottom Left corner of the Processor is the - Sys_Fan 1 header)

This is HP Support, and the motherboard specifications page. It has an illustration of the motherboard, as well as a photo of the motherboard,

The connector on the wire for the fan, will only plug in, in one direction.

The header on a motherboard is the male connector. It has pins that stick up.

The connector on the fan wires, is a female connector.

The header on the motherboard has a tab of plastic on one side, that sticks up.
This lines up with a cutout shape on the connector for the fan wires.

Mar 07, 2010 | HP Pavilion m7580n PC Desktop

1 Answer

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.

Dec 03, 2009 | E-Machines eMachines Desktop PC

2 Answers

Won't turn on with new power supply

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

May 02, 2009 | HP Media Center M370N (DM163A#ABA) PC...

6 Answers

Computer wont start up. Blinking green light in the back of tower

I've had that happen twice to my Vaio desktop and there was a very easy fix. I'm not a techie, but I found a recommended solution online when this first happened six months ago. I couldn't find the solution again, but I fortunately remembered the steps.

Remove the side pane to access your motherboard cables, etc. Locate the connector on your motherboard that contains the wires going from your power supply to your motherboard. It will be a large, rectangular connector with a lot of individual wires It is not a ribbon cable but should be located next to a ribbon cable connector andnext to a geen blnking light on your motherboard (when the power supply is plugged into the wall). Note: This green blinking light is in addition to the green blinking light on the back of the PC.

This next step is important: You have to disconnect the connector noted above from the motherboard WHILE the power suply is plugged into the wall. Wait a few seconds and plug it back in. The blinking reen light on the motherboard should now be a solid green light. The PC should now power up.

It worked twice for me; I hope it works for you.

Mar 05, 2009 | Sony VAIO VGC-RB42G PC Desktop

1 Answer


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.

Jan 28, 2009 | E-Machines eMachines Desktop PC

2 Answers

My computer won,t turn on

2x2 or 2x4 Power Connector Not Plugged In
If the power supply cable with the 2x2 connector or 2x4 connector (depending on your desktop board), is not plugged into the 12V processor core voltage connector located near the processor socket, the system will not boot up. You will see lights onboard and on the chassis front panel and the processor fan will spin, but nothing will appear on the monitor. See figures below for cable placement.
  • Make sure the fans on the processor are connected properly and running.
  • Make sure that the thermal interface material or the thermal grease is applied to the processor properly.
  • Make sure that the power supply fan is running properly and any other external case fans are running properly.
  • Make sure that the air intakes for the external fans are unobstructed and have at least several inches away from walls and other items.
  • Oct 08, 2008 | Gateway 3250S PC Desktop

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