Question about Compaq Presario s4020wm (DK214AR#ABA) PC Desktop

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Power supply hookup

Hooking up connectors to right areas in cabinet,they have p nos on them just want to be sure

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  • Anonymous Mar 02, 2008

    at end of power supplt the connectors are labelded,b6,b8,b4,b2,b5,b3 not sure where they go some r 6 wire and some are 4 wiring had to2 crossed fform floppy drive to hard drive??? i had it wrote down and lost notes. ordered new hard drive from western


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No power acer s280

Yes. A few.

1) Sometimes we inadvertently bump wires loose, when we are replacing hardware.

The Front of your computer is the Front Panel.
The area of contact pins on the motherboard, that the main wires from the Front Panel go to, is the Front panel header.

Two of these twisted pair of wires are for the Power On switch.
Are they connected tightly to the pins in the Front Panel header?

2) There is a main power wire that comes from the Power Supply, and plugs into the motherboard.

(You can click on the photo to enlarge)

The Black long connector at the top is for a Floppy Drive.
Under it the Blue long connector is for the Harddrive.
Under it is the White long connector for optical drive/s
(CD/DVD drive)

(I may have the blue connector, and black connector, functions reversed. Blue IS supposed to be for the harddrive, usually)

To the left of them, is the whitish long 20-pin ATX main power connector on the motherboard, (20 socket holes), that the 20-pin ATX main power cable plugs into.

General example of a 20-pin ATX main power cable, and it's respective connector on the motherboard,

In the middle photo observe the whitish connector. Looking close observe the Lock on the side.
Viewing the photo to the left, observe the Tab on the motherboard connector.

When the hooked end of the Lock is over the tab, on the motherboard connector, the power cable is plugged in properly.
Is the 20-pin ATX main power cable plugged in correctly?

Everything is chilly?

3) Then it's time to bypass the Power On switch, and see if the problem is the switch, or the Power Supply.
Yes, a Power Supply can go t1ts up all at once.

Bypassing the Power On switch, has nothing directly to do with the switch. No insulation of wires is cut.

Your Power Supply converts AC electricity from your home, or business, into LOW DC voltages. The shock hazard is contained inside the metal case of the Power Supply.
You will be dealing with 5 Volts DC.

In comparison two D cell flashlight batteries store 3 Volts DC.

A jumper wire goes down into the BACK, of the 20-pin ATX main power cable's connector.
Plugged in just like the photo to the far right in the Playtool link.
Power Supply plugged into power.

Goes down into the socket hole, RIGHT NEXT TO the existing wire, already in the socket hole.
Right next to the insulation of the wire, and down in the socket hole far enough, that the jumper wire touches a metal terminal.

All the wires going down into the power cable's connector, end in a metal female terminal,

You are seeing the tips of the female metal terminals, in the middle photo of the Playtool link. (In the Molex link above, the tube shaped end to the right, is what you are seeing the tip of)

The jumper wire will be touching the crimped side of the metal terminal, as shown to the left in the Molex link. (Terminal is shown un-crimped)

Make SURE the jumper wire touches the metal terminal.

The preferred jumper wire is a straightened out paperclip, and bent into a U-shape. The top of the U, is wrapped a few times with black plastic electrical tape. This taped area is for your fingers, and thumb to hold onto.

U-shaped jumper wire upside down, it has two 'legs'.
It is these 'legs' that go down into the socket holes.

Observe the photo to the far right, in the Playtool link.
The Green wire is the Soft Power On wire. Abbreviated as PS_ON.
One leg of the jumper wire goes down into the socket hole, with this Green wire.

The other leg of the jumper wire goes down into ANY socket hole, that has a Black wire in it.
ALL Black wires are Ground wires.

The contact made is no more than 2 seconds.
(The Power On switch is a Momentary Contact Switch)

IF, the Power Supply comes on, you have a bad Power On switch,

IF, the Power Supply does Not come on, you have a bad Power Supply.

For additional questions please post in a Comment.

Jul 23, 2012 | AcerPower S280 PC Desktop

1 Answer


After reading an article about Emachines awhile back, I found out the reason you can't find the schematic- it isn't available, as some motherboards are made specifically for Emachines and therefore not distributed, as they might normally be, but again, others are, but you have to identify them and go through another source to get them- Emachines, appartantly, will not supply them. All is not lost, however...all motherboards have, basically, the same hookups and connectors for the power supplies, hard drives, etc.- they are standard. I found a web blog that explains the power switch, reset, and power led, which will help. Here it is:
This site will explain about the 24 pin connector from the power supply
If you google "motherboard wiring" you will find sites that have illustrations of the motherboard, and explain which connectors go to which sockets, and how to identify them.
With a little patience and determination, you should be able to hook everything up from the various blogs on the net. Hope this helps.

Apr 17, 2010 | E-Machines eMachines Desktop PC

1 Answer

I have a HP-Pressario 10 Desktop which had the cables from the 250 watt power supply unhooked. I need a diagram to rehook the cables correctly. This is a 20 pin hookup.

well the PSU cables for the mobo should only be able to be hooked to one place on the board. i'm not sure if this is a 20 pin and a 4 pin or just a 20 pin, but the 20 pin connector should only fit one place and snap in. you don't need a diagram, if you're wondering about all the rest of the cables it doesn't matter where you plug what 4 pin connector to. as long as they're connected..

Oct 02, 2009 | Compaq Computers & Internet

1 Answer

Hp pavilion 764c wire diagrams

Take a picture of the inside of your computer and put it up on the website with the wire connectors that need to be connected. The connecting wires should be in four groups. 1. The power supply connectors. These connectors will supply power to to all the power using components not supplied power by the motherboard itself. 2 The connections to the other components in your system like the dvd/cd player and the harddrive and floppy drive.3. The motherboard connections for the case. The power switch connector andreset switchconnector. The power led and theharddrive activity light.The USB connector and the audio connector.The fan connections like the cpu fan and other fan only connectors found on the motherboard.The external fans ( Fans that need to be connected to the power supply).Most of these connections are labeled on the motherboard. The case connectors also should be labeled for the correct connection. The best way to find the answers to this hook-up, may be to call HP pavilion with your computer make and model number,motherboard model number including revisions number. Computer made by big manufacturers tend to have may revisions and the only way to make sure your are getting a correct hook-up to the motherboard is call them for assistance.Especially if the motherboard and case labels are not present or so small that they cannot be read.Hope this helps you with your problem.

May 16, 2009 | HP Computers & Internet

3 Answers

Tried new power supply but didn't help. (Who knows - maybe I didn't install correctly.) I first thought it was the power switch on front of machine. Was wondering if some easy test for power switch?

Tips from me:

1.If your power supply isn't coming on, I advise you to check the 20/24-pin motherboard power cable,
connector, and be sure it's down in tight. Make sure that lock tab of the power cable connector, snaps over the motherboard connector lug. Make sure that connector is in all the way.

2.Be sure the wires that come from the Power On switch, and go to the motherboard, are connected, and down all the way. The connector, or individual connectors, need to be down on those motherboard pins all the way. (The area on the motherboard where they connect, is called the Front Panel header. A connector on a motherboard is called a Header)
Also make sure both wires from the Power On switch, (Button), are connected to the motherboard, if the wires have individual connectors.

Now, how to test to see if the Power On switch is bad.

The 20/24-pin ATX motherboard power cable connector comes in three styles.
A.20-pin connector. Has two rows of 10 socket holes
B.24-pin connector. Has two rows of 12 socket holes
C.20-pin and a 4-pin connector.

NO matter what style it is, it has a Green wire going to that connector. The Green wire is the
Soft Power On wire.

With the motherboard power connector plugged into the motherboard, and the computer plugged into the surge protector, you need to jump that Soft Power On wire, to a Ground wire.
View these photos of a 20-pin ATX Main power cable. (Motherboard power cable, Main power cable.

Look at the photo all the way to the right. (You can save this page, and bring it up in a new window)
This shows that Green wire. Fourth one from the left.
Next to it is a Black wire. Fifth one from the left.

ANY Black wire is a Ground wire.

You need to make a jumper wire. This wire should have insulation on it. It should be as thick as those power cable wires. It should be about 3 inches long. You need to strip off 3/4ths of a inch of insulation, off of EACH end. Twist the exposed wires. Make a tight wrap. Bend this wire into a U-shape.

At this point you may want to don a protective rubber glove. Tightly fitting dishwashing glove, or perhaps a surgical style one. Reasoning is, that there will be a spark. You may feel more safe this way. I don't use one, but I'm an old tech, and maybe not too Tightly Wrapped! lol! (I also was a journeyman lineman, so this spark doesn't bother me!)

With the ATX motherboard power cable plugged into the motherboard, you are looking at the back of the connector. The wires go down into a socket. At the end of every wire is a metal terminal end.
It's pretty far down in there. One end of your jumper wire, goes down deep into the Green wire socket. It needs to touch that metal terminal end.

The other end of your jumper wire, needs to touch a Ground wire terminal end. ANY Black wire is a Ground wire. Just stick the end down into a socket with a Ground wire. Hold it there for about 1 to 2 seconds, bring the wire back out. You just want to make a Momentary Contact.
Your power supply should start.

If so, you have a bad Power On switch. If not, your problem is the power supply, or the motherboard.

Apr 19, 2009 | E-Machines eMachines Desktop PC

1 Answer

I bought a 500 watt power supply

depends on the connector , most newer power supplies have a detachable 4-pin stuck to the side of the 20-pin making it 24. use the whole 24-pin plug if it fits , if you only have a 20 pin connector on the motherbaord, detache the 4-pin from the 24-pin making it 20.

Apr 07, 2009 | HP Computers & Internet

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

1 Answer


find out if it is AT or ATX cabinet
AT cabinet will have a power ON/OFF switch just like a 2 way switch
ATX cabinet will have soft switch for ON/OFF
Mostly all the new cabinets are ATX type.
To make it sure, open the cover and check the power connector to the motherboard. If its a rectangular double layer connector, it is ATX power supply, on the other hand if its a two piece single layer connector, it is AT power supply
hope this information will solve your problem
good luck

Jun 17, 2008 | Dell Computers & Internet

1 Answer

Ribbon hook-up

You should be using two, two connector IDE ribbon cables if I understand your questions correctly.

On IDE 0 you connect the hard drive and one cd drive.
On IDE 1 you connect the second cd drive.

You will need to make sure the jumper settings on the drives are correctly set.

Jan 02, 2008 | Computers & Internet

1 Answer


Make sure you made all the connections properly. I'm not sure if the motherboard on that computer has the four pin aux power supply for the processor, but if it does and you didn't hook it up, you won't get anything. It's a square shaped connector with yellow and black wires. Some power supplies don't have this connector and will not work on a board that requires one.

Oct 20, 2007 | Computers & Internet

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