Question about ASUS A7N8X-X Motherboard

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On, reset, both indicator lights place ment for wires on the 12 peg terminal

I have six wires to place all two wired colors. I know the black and green is the on button but in all I have no idea what prongs to place them on. I cannot find the motherboard A7VBX-X

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This Link will take you to the web site enter the version # and download the pdf manual.

Posted on Mar 28, 2008

  • Mark Williams
    Mark Williams Mar 28, 2008

    Sorry that link is for the A7N8X-X

    This Link is for your boards manual


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Fault finding

Power is going to the motherboard, and you know this by assuming?

An assumption would be you see the Power Supply fan spin, LED lights light up, and maybe computer case fans spin.

Not an assumption, and you would have tested the 3 main voltage power rails, coming out of the Power Supply.

The Power Supply in your computer is an SMPS.
Switched-Mode Power Supply. (Also is known as the short abbreviation - PSU. Power Supply Unit)

The Power Supply in your computer is a Converter.
It converts HIGH AC voltage into 3 LOW DC voltages.

[Depending on country,
USA = 120 Volts AC. UK = 240 Volts AC. Japan is 100 Volts AC, but may depend on area. Australia = 240 Volts AC. India = 240 Volts AC. HOWEVER, do not write the above in stone. I may have made an error ]

The 3 low main DC Voltages coming out of the Power Supply is;
A) 3.3 Volts DC
B) 5 Volts DC
C) 12 Volts DC

Orange wires carry 3.3 Volts DC
Red wires carry 5 Volts DC
Yellow wires carry 12 Volts DC
ALL Black wires are Ground wires. They can also be called Negative wires.
This is a DC circuit now. There is a Positive, and a Negative.
Orange, Red, and Yellow wires are power wires, and also Positive wires.

The first part of your diagnosis will be to test those 3 main voltage power rails.

Using an example;
There are many Red wires coming out of the Power Supply.
These are 5 Volt wires. They are Connected TO, the 5 Volt power rail in the Power Supply.
ALL 5 Volt wires end in one place, in the Power Supply.
The 5 Volt power rail.
When you test just ONE red wire, you are testing the entire 5 Volt power rail coming from the Power Supply.

This also goes for the Orange wires, and Yellow wires ]

With the Red 5 Volt wires, and Yellow 12 Volt wires, you could just use a 4-pin Peripheral power cable to check them,

Multimeter set to DC Voltage, the red (Positive) probe lead of the multimeter; touches the female metal terminal connector, for the Red wire.

The black (Negative) probe lead of the multimeter, touches a female metal terminal connector, that goes to a Black wire.

You should be reading 5 Volts DC.

Same thing for the Yellow 12 Volt wire.

With an Orange 3.3 Volt wire, this changes.
A straightened out paperclip is inserted, down into the BACK of the ATX main power cable's connector; AND into a socket hole with an Orange wire in it.

The straightened out paperclip, slides down into the socket hole, with the Orange wire in it.
Slides down into the socket hole, RIGHT NEXT TO the orange insulation of the wire, and MUST go down far enough; to Touch that female metal terminal connector.

EVERY wire going down into the ATX main power cable's connector, ends in a female metal terminal connector.

Same thing is down with a socket hole that has a Black wire in it.
ALL Black wires are Ground wires. (Negative)
You can choose ANY socket hole that has a Black wire in it.

Now touch the two probe leads of the multimeter, to their respective straightened out paperclips.

Red (Positive) probe lead of multimeter, to straightened out paperclip in Orange wire socket hole.
Black (Negative) probe lead of multimeter, to straightened out paperclip in Back wire socket hole.

You should be reading 3.3 Volts DC.

(Or if your multimeter kit has special probe lead, that would take the place of a straightened out paperclip, of course use it instead)

Know this;
A) If ALL of the LED's ('lights') were on at once, they would use less than 1 Watt of power.

B) EACH fan uses 2 to 3 Watts of power.

C) A typical CPU (Processor) can use 51 to 130 Watts of power.
Just depends on what Processor (CPU) it is.

This is why a Power Supply with a weak voltage power rail, will not have enough power to turn the Processor ON, but will have enough power to light those simpy LED's, and spin fans.

[LED - Light Emitting Diode ]


May 11, 2013 | Dell Computers & Internet

1 Answer

How to connect EPIA_M860-12E to a monitor for starting it?

1) Power Supply to Motherboard
2) Motherboard to Monitor

Motherboard has Processor, and Ram Memory on it.
Monitor cable plugs into I/O area on motherboard.
(Input/Output area. Where the Mouse/Keyboard/Audio ports, etc, are)

You can lay the motherboard on a piece of cardboard, then on the table you're working on.
Make SURE you are FOLLOWING Anti-Static Precautions. If you are not aware of what these precautions are, please post back in Comment.

To start the Power Supply, jump the two contact pins in the Front Panel header on the motherboard, with a small flat tipped screwdriver. (Jewelers screwdriver is the best for this)

(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.
Main wires being;
Power On switch, Power On LED light, HarDDrive activity LED light, and Restart switch; IF your computer uses a Restart switch )

If that doesn't start the Power Supply, then use a jumper wire on the Green, Soft Power On wire, to ANY Black wire. ALL Black wires are Ground wires. (Negative connection)

The contact period is NO more than 2 seconds.

Bottom -> Users Manual UM_EPIA-M860_113.pdf

After you click on the above, a small window will come up on the right.
Make SURE there is a Green dot in the small circle to the left of -
Open with.
If not, click in the empty circle to the left of Open with.

[Should state Adobe Reader (default) in the box to right of Open with]

The Front Panel header is on Page 31 (Adobe Reader page number box at Top)

Two rows of contact pins.
TOP row is numbered EVEN.
BOTTOM row is numbered ODD.

Top row from Left to Right, is Pins 2, 4, 6, 8, 10, 12, 14, and 16.
Bottom row from Left to Right; is Pins 1, 3, 5, 7, 9, 11, 13, and 15.

Pins 6 and 8 are for the Power On switch.

{ Pins 2 and 4 are for the HarDDrive activity LED light.
Pins 10 and 12 are for a Reset switch, IF a Reset switch is used.
Pins 14 and 16 are N/C. Not Connected.
Pins 1 and 3 are for a Dual color Power On LED light.
Pin 5 is the Ground for the Dual Color Power On LED light.
Use pins 5 and 7 for a two wire Single color Power On LED light.
Pins 9 and 11 are N/C.
Pins 13 and 15 are for an internal speaker. The small speaker/buzzer for hearing BIOS Beep Codes ]

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

You want the main power cable plugged into the motherboard, as shown in the photo to the Right.
The Green wire is the Soft Power On wire.
-> ANY Black wire is a Ground wire.

The preferred jumper wire is a straightened out paperclip, 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.

Turn the U shape over, and it is the 'legs' of the U that you are going to use.

One leg goes down into the socket hole, where the wires go into thew connector; RIGHT NEXT TO the Green wire, and slides down in.
Slides past the green insulation of the wire, and Touches a metal terminal at the End of the wire. MUST touch that metal terminal.

The other leg goes down into a socket hole, with ANY Black wire in it.
The contact period is no more than 2 seconds.

Power Supply comes on you have a bad Power On switch.
Power Supply does NOT come on; you have a bad Power Supply.

The Soft Power On circuit is 5 Volts DC.
In comparison two D cell flashlight batteries produce 3 Volts DC.
However, not stating that there may be a small spark, as you connect the U-shaped jumper wire.
For this reason you may wish to use a glove, on the jumper wire hand.

Cross-compile connections? I am at a loss.
Explain further in a Comment.


Nov 30, 2012 | VIA Epia M860-12e Fanless Mini-itx...

1 Answer

How do i know when its my motherboard is the problem and not the power supply when my computer wont stau powered up.

Usually Malisha the Power Supply is diagnosed first, to make sure it isn't the problem.
Motherboard checks are stated further in this solution.

Voltages coming out of the Power Supply are checked, Or a KNOWN to be good, Compatible power supply is borrowed from another computer, for a test unit.

High AC voltage, from 100 to 240 volts depending on what country you are in, goes into the Power Supply, and is converted into 3 low DC voltages;
A) 3.3 Volts DC
B) 5 Volts DC
C) 12 Volts DC

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

Orange wires are 3.3 Volts
Red wires are 5 Volts
Yellow wires are 12 Volts
ALL Black wires are Ground wires.

I use a straightened out paperclip, stuck down into the Positive wire's socket hole, in the Back of the ATX main power cable's connector.
The back of the connector is where the wires go in.

[The 3.3 Volt wires, the 5 Volt wires, and the 12 Volt wires; are the Positive wires.
ALL Black wires are Ground wires, or can be said as Negative also ]

The Straightened out paperclip is an extended probe lead, for the multimeter. It must slide down next to the insulation of the wire, and Touch a metal terminal.

EVERY wire going into the ATX main power cable (20 or 24-pin), ends in a metal female terminal. This female terminal slides over contact pins on the ATX main power cable's connector, on the motherboard.

This is an example of the Molex female terminal,

You can see the front open tips, of the female metal terminals, in the center photo,

Let's test the 3.3 Volt power rail.

20 or 24-pin ATX main power cable is plugged into the motherboard, as shown in the photo to the far right.

Straightened out paperclip is inserted down into the socket hole, with any Orange wire in it. Pick ANY Orange wire.
It is slid RIGHT NEXT TO the Orange insulation of the wire, until it touches the metal female terminal.

Now another straightened out paperclip, is inserted down into the Back of the ATX main power cable's connector, (Where the wires go in), down into a socket hole with ANY Black wire in it.

Down into the socket hole, RIGHT NEXT TO the insulation of the Black wire, and touches the female metal terminal.

Power supply is plugged in.
Positive (Red) probe lead of multimeter touches straightened out paperclip in Orange wire socket hole.
Negative (Black) probe lead of multimeter touches straightened out paperclip in ANY Black wire's socket hole.

[Multimeter function knob is set to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line ]

You should be reading very close to 3.3 Volts.

Pick an Red wire, and Black wire; look for 5 Volts.
Pick any Yellow wire, and Black wire; look for 12 Volts.

When a computer won't stay powered up, and it's a motherboard problem, the Electrolytic Capacitors on the motherboard are the problem.

The ones used are Radial design.
Radial Aluminum Electrolytic Capacitors.
They have an Electrolytic paste inside that goes bad, when they are failing, or have failed.

Newer designs of capacitors used are now Solid capacitors. Type used now is of Polymer design.
Solid Polymer capacitor.
Tantalum was the fore runner.

When these babies go bad you know it. They explode like miniature hand grenades. Shrapnel sprays inside the computer case.

So if you have a problem with capacitors on a motherboard, it will more than likely be Electrolytic Capacitors.

1) Visual identification of failure,





Have I replaced capacitors on motherboards, and to have them work just fine afterwards? Yes. Using one right now that I changed 'caps' on, back in 2008.

1) There was a Capacitor Plague that has been around since the '70's, and is still affecting us. Company espionage,

2) The second thing in this 'equation',....

Computer design engineers know that the Electrolytic Paste inside an Electrolytic Capacitor, breaks down over time.
It is a chemical, and has a chemical breakdown.

Due to this they use a capacitor that is rated at Twice, what is needed. Or can be said as 200 percent.
This way when the capacitor breaks down to 50 percent good, it is still 100 percent good for the circuit it is in.

So yes, it is highly feasible to replace capacitors, and have a working motherboard again.

[ To go deeper in case you are interested;
Capacitors on a motherboard are used as Filters, and Voltage Regulators.

The ones used as voltage regulators, are in the motherboard voltage regulator circuit, ]

Need guidance in removing, and replacing capacitors? Post in a Comment.
Have additional questions? Post in a Comment.


Nov 14, 2012 | Intel Computers & Internet

2 Answers

Front panel connectors

Black or white is negative, color is positive. Pin 1 is usually positive.

Also, If you look closely at the plastic plug, there *should* be a tiny triangle/arrow....that's the "+".

May 18, 2012 | Computers & Internet

1 Answer

Vga wiring i want to know what each coler wire represents so i wont burn my pc wiring my stuff into it

Here's some wiring diagrams:
First according to pin:
And in this post you have pinouts according to standard color:
db15 male
6)dark green
7)light green
8)dark blue
10)light blue
11) purple

DB15 Female
7)light green
8)dark blue
10)light blue

that's all oh yes you also have a ground wire from connector base to connector base.

Hope this helps. So from these two, you should be able to figure out witch wire is witch. Let me know if you need more detailed information.

May 03, 2011 | VIA ASUS A8V-E Deluxe K8T890 chipset...

1 Answer

How do i connect the casing power to the motherboard

Open ECS web site and download the manual for your MB, P4VMM2 V7.3;
You will need Adobe reader to view the manual if you currently do not have it. Download and install Adobe; With Adobe you can zoom in and out to assist you in connecting your case to the motherboard. Start with page 9. Page 12 and 13 shows you how to connect your case LEDs to the motherboard. Pin 1 is positive for your HDD_LED. Pin 3 is negative for the HDD_LED. ECT. Most wires coming from the case are inserted into a jumper and most jumpers are marked. Ex: HDD for hard disk drive, RS for Reset Switch, PW for power on/off switch ECT.
The case wire colors do vary from case to case. The wire colors blue, light blue, green, light green and red are most common to be positive. The colors white and black are common for negative. Below is a picture of a typical front panel case to motherboard hook up. Less the white standoff jumper block.


Your board uses an internal speaker. Connect the red wire to pin 1 and connect the black wire to pin 4. See page 11 for location and page 12 for connection.
Use the manual. Its a great guide.

Happy holidays!

Dec 19, 2009 | EliteGroup Via P4M266A (P4VMM2 V7.3)...

1 Answer

Need help with motherboard power connection wiring.

i have no mother board cd then system is formatting is not possible please help me i want drivers cd

Apr 11, 2009 | Compaq Computers & Internet

1 Answer

How to place indicator led cables to motherboard

hey look close to the nearby processorin motherboard there is 9 pin (depends on motherboard) for power and for reset button... close your eyes to motherboard at that place you will find also the name which are mention in motherboard e.g. power and reset in motherboard just plug red wire in power and and green for reset ( depends on motherboard) you an chk manually ...

Apr 05, 2009 | Computers & Internet

5 Answers

Gigabyte GA-8INXP Motherboard Problem- front connector pins

If the wires from the reset switch is white/blue the blue wire is positive, Hdd red/white red is positive power Green/white Green is positive etc. The wires on the speaker connector will be red/black/black/white - red is positive. The colored wire is always positive. On all GA mb's the positive connection is always towards the back of the MB and are marked with a + on the base of the pin as you can see on the photo. Hope this help.

Sep 19, 2008 | Gigabyte GA-8INXP Motherboard

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