Question about Dell OptiPlex GX260 PC Desktop

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Dell motherboard does not come at all

When i connect working power supply to my motherboard n switch it power does not come at all

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  • P. Thomas
    P. Thomas May 11, 2010

    hmmm...that may mean that motherboard is not working..can you tell more about the computers failure mode?

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  • 2,992 Answers

If the power doesn't come on at all, or the system powers up but never starts up, it almost certainly means the system board is board is bad. I have fixed 3 Gateways and 2 Dells in that last six months that required board replacement. A good place to try for boards is www.blueraven.com.


Posted on Nov 21, 2008

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Computer won't turn on.


There must be a problem with your power switch on your computer casing, or motherboard or power supply.

Detach your power supply and try this, to check if your power supply really works. If the auxiliary fan will turn, your power supply is good
25627818-lfqggqo5gl3n2v4xynrvsb5u-5-0.jpg Testing your power supply and motherboard as seen on photo
25627818-lfqggqo5gl3n2v4xynrvsb5u-5-2.jpg If the cpu cooling fan and power supply did not turn the fan, but you have checked already the power supply that is working then you can conclude that your motherboard is need to be replace. But the power supply and motherboard and working, meaning to say your computer casing need to be replace or try fixing the contact of the switches attach to your casing.

Have a good day.

Apr 04, 2015 | Dell Studio Xps 9100 Desktop Computer

1 Answer

Burnt connector inside dell inspiron, first connector at motherboard (after power box) Can I fix it?? If so, can u help??


LOVE your user name!

I'll try to guide you the best that I can.
Sorry, first connector after Power Supply does me no good.

Let's look at a basic schematic of the motherboard for a Dell Inspiron 530s Desktop PC,

Dell Support > Inspiron 530s Desktop PC > Dell Inspiron 530s Series Owners Manual,

http://support.dell.com/support/edocs/systems/insp530s/en/OM/HTML/index.htm

I would like you to click on - Removing and Installing Parts
In the left column click on - System Board Components
{System Board = Motherboard }

This is a basic view of the motherboard with No hardware components installed.
It is also how the motherboard sits in your computer.

This is a pictorial view of the motherboard,

http://www.amazon.com/Dell-Motherboard-Inspiron-Systems-Compatible/dp/B003CO0WQS

Now, compare the Dell Support motherboard illustration, to the pictorial.
Looking to the far right in the illustration, the first connector is marked with the number 8.

On the pictorial it is the rectangular Black connector at the bottom/middle. (Next to the rectangular White connector)

This connector is for a Floppy Drive.
Is this the connector in question?

Is it the white rectangular connector next to it?
This connector is for the main power cable coming from the Power Supply.
In the illustration is is marked by the number 7.

This is a basic example, of the power cable coming from the Power Supply (power box), that connects to the white connector,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain24

{Note* Color of the main power cable's connector does not matter. It can be any color }

IF this connector on the motherboard is burnt, you may wish to stop.
Electricity has more than likely fried the entire motherboard. May also include the Processor, Ram Memory, Harddrive, and a graphics card, if installed.

I know. I'm a 'ray of sunshine'.

How could this connector be burnt?
Four ways I know of;

1) Lightning storm, or power outage. Also could have happened if the power utility company was doing some changes in the power lines, utility pole transformer, etc.
(No. The utility company cannot be held responsible. I don't agree with that)

2) Power cable was not plugged in tightly. Lock on side was not locked into place.
Air gap created in-between the connecting contacts in the power cable connector, and the motherboard connector, created resistance.

Resistance creates heat. Burnt connector/s will result, and perhaps worse.
{Could also create a small power surge }

3) At one time Dell was a Proprietary computer manufacturer.
This means Dell wanted THEIR replacement parts used on THEIR computers.

If an aftermarket computer component is installed, Dell cannot warranty their computer.
Using THEIR parts in THEIR computers, Dell could.
However Dell computer users did not wish to pay the price of the Dell replacement parts.
The aftermarket parts were cheaper, of good quality, and readily available.

If we use a Power Supply for an example;

Dell had the motherboard manufacturer switch the socket holes around, in the Motherboard connector, for the main power cable.

They also had the Power Supply manufacturer switch the pins around, in the 24-pin ATX main power cable's connector, to match.

The aftermarket power supply manufacturer built the power cables, and connectors, to follow industry standards. Dell did not.

This means if you plug an aftermarket power supply's main power cable, into a Dell motherboard that was built proprietary, the motherboard usually fried. The only sign may be a burnt connector on the motherboard.

Could also have fried the Processor, Ram Memory, Harddrive, optical drive/s, and a graphics card, IF installed.

[ Looking at the Playtool link again, look at the photo to the far right.
See the different colored wires?
The color coding indicates what the wire carries as far as Voltage, or if it is a Ground wire.

1) Orange insulated wires = 3.3 Volts
2) Red wires = 5 Volts
3) Yellow wires = 12 Volts
(All are DC. In comparison two D cell flashlight batteries produce 3 Volts DC)

4) The Black wires are Ground wires

(The Green wire is the Soft Power On wire. Abbreviated as PS_ON)

The Orange, Red, and Yellow wires are power wires.
The Black wires are Ground wires.
Guess what happens if a 12 Volt wire is connected to a Ground?
(Instead of going to a 12 Volt connection)

Things start frying.

{To state connections in the main power cable connector, and it's respective connector on the motherboard, correctly;

Looking at the middle photo you see the connection end of the main power cable.
Plastic connector with individual plastic rectangular shapes, that have metal 'tubes' inside each of them.

The motherboard connector has socket holes to match the individual plastic rectangular shapes.
Inside the socket holes are metal pins. Contact pins.
The contact pins go inside the metal 'tubes'.

The metal 'tube' is a Molex Socket Terminal,

http://www.mouser.com/ProductDetail/Molex/36664-0002/?qs=sGAEpiMZZMvz8LftK4jerhl0r50z%252bUNRzFCdHbJqUTU%3d


4) IF the Power Supply, ( looking at it from the Back of the computer), has a rocker switch, or slide switch, to set the incoming AC power to 110 Volts, or 220 Volts;
And the power supply switch was set to 110, and plugged into 220 Volts,
the motherboard connector would fry.

Plus the Power Supply. May also of course include Processor, Ram Memory, Motherboard, Harddrive, optical drive/s, and graphics card IF installed.


Replace the connector? No
Could be;
A) Replace the Power Supply. Still no?
B) Replace the Motherboard. Still no?
C) Replace the Ram Memory. Still no?
D) Replace the Processor. Computer operates but no graphics?
E) Graphics card installed? Replace graphics card

Unless you can test each individual component, and the cost is not much less, or equal to a new computer, the obvious choice would be to purchase a new, or good used computer.

Nov 01, 2011 | Dell Inspiron 530s Desktop Computer

1 Answer

Dell optiplex Does notb Run. Switch Button is blinking. Powerb Supply is ok. Ram ok. I use Another good power supply but same problem Power Button blinking. Whats the solution.


The next thing to check is your Motherboard. Remove all devices (hard disk, cards, memory, etc) just the motherboard connected to the power supply, just to see if the motherboard is working right. Your should be hearing a beep sound indicating that the board is alive. If yes, you may reinstall the rest of the devices you removed.If no, replace motherboard or processor.

Jul 09, 2010 | Dell OptiPlex GX520 PC Desktop

1 Answer

My xps710 was flashing amber tech said motherboard or power supply problem replaced both with 720 motherboard new power supply upgraded system with windows 7 additioal harddrives and bluray. same problem...


If the power light is blinking amber, the computer is receiving electrical power, but an internal power problem might exist.

Ensure that the voltage selection switch is set to match the AC power at your location, if applicable

Ensure that the processor power cable is securely connected to the system board

Click on the link below for a diagram of your system motherboard:

http://support.dell.com/support/edocs/systems/xps710/en/SM_EN/techov1.htm#wp1063887

Have you added any new hardware?

If you have replaced the Motherboard a common error is that one of the power connections to the motherboard is not connected, double check all connections.

Apr 13, 2010 | Dell XPS 720 (dxcwuh4_2) Intel Core2 Duo...

1 Answer

Installed new dell motherboard per tech, installed new Dell power supply as it died too. This is a Dell Dimension 2300. It won't start.


Check all connections, to the motherboard, and also to the wall Verify that the power supply is actually switched into the ON position at the rear of the computer.

Mar 09, 2010 | Dell Dimension 2300 PC Desktop

1 Answer

My Dell Dimension 3000 PC won't start when I push the power button


A.Bad Power On switch. (Behind the Power On button)

B.Bad power supply

C.Power supply cables have come loose inside the computer.
1.Power supply to motherboard. (20-pin connector on motherboard)
This connector has two pins in it for Soft Power On. The power supply does not connect directly to the Power On switch. The power supply connects to the motherboard, and turns on via Soft Power On.

ADVISEMENT!!
ALWAYS have the computer unplugged from power before reaching inside!

ALWAYS work on a table. DO NOT work on a bed, or directly on a carpet floor. These are high areas for Static electricity! Static electricity will silently burn out computer hardware components. You may not see it or feel it.
Touch the metal frame of the computer case, to relieve your body of static, BEFORE you reach inside.

Sep 30, 2009 | Dell Dimension 3000 PC Desktop

3 Answers

All the cords are connected but there is no power going to my tower so it doesn't turn on


If you have a totally dead computer with no lights then the power supply might be bad, replace it with a new one or a known good working one.

If you replace the power supply and the machine still doesn't turn on then the motherboard is bad and would need to be replaced.


Aug 03, 2009 | Dell Dimension 5100 (D51L1) PC Desktop

2 Answers

Dell gx270 power switch


I don't think you need a new switch. The power "switch" on the front of computers today is a momentary action push button switch. Not a locking or clicking switch as older computers used to have.

Many of today's computers, including the gx270 / gx280 computers from Dell are really always on. You can see the green or yellow LEDs on the motherboards glow when they are "off" (like a sleep mode).

They are in a "sleep" mode until you push the power switch, which sends a momentary signal off to the motherboard to fully power up and turn itself "on".

I think you have something else happening here. When the system tries to power itself up, and detects a severe problem, it will try to automatically turn itself off.

The problem could be a bad motherboard, power supply, memory or processor. It could even be a failed hard disk that is drawing too much power (shorting out) from the supply.

If you had done something to the system, like move it or open it up for an upgrade, etc.. Look again at all the internal connections, and make sure there is nothing rattling around inside that might also be causing a short.

You could try removing all the PCI cards in the system, removing the power and data cable connections from all the disks (Floppy, Hard Disk, CD/DVD) and see if the bare motherboard (with CPU and memory) will boot by it self. If it does boot, then the problem was somewhere in those items and you can replace them one at a time until you find the problem, or if it all works again then it may have been a loose or bad connection.

If you have another machine available, you could try switching the power supplies and seeing if that is the problem.

Good luck!

-Chip

Nov 21, 2008 | Dell OptiPlex GX270 PC Desktop

4 Answers

Dell Dimension 9100 will not power up


Most likely the power supply have failed. Although the system is getting some power to the Motherboard (Flea power indication on motherboard) there are at least 5 different voltages the power supply provides for the system. Losing any one can cause a no power situation like you describe.

A standard ATX power supply should resolve (It is the 1st item I'd replace, both because it is the 1st point of failure and the cheapest to replace)

Here is one ATX power supply:

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182030

Jun 13, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

1 Answer

No power


IT is most likely the Bad Refirb Motherboard or it can be the Power Supply. if the power supply turns on. than it is the Motherboard. if it doesn't than it is the Power Supply. Make sure you connect the power switch to the motherboard. the newer motherboards are more switches than the old Motherboards!

Hope that helps.

Dec 25, 2007 | Dell Dimension 4500 PC Desktop

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