Question about Compaq Refurbished 280WATT POWER SUPPLY FOR PROFESSIONAL WORKSTATION 5100 Power Supply

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Standby of 5 volts ok Note that the wire colors are different from standard on the ATX connetor. Did try connecting PIN 14 to ground with a cd rom attached to one of the standard 4 pin power connectors.

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I have seen 2 models ,one compatible ATX the other not,to figure how it turns on try with a lamp 12V 1W (like xmas tree lamp) first to gnd and later with 5v standby.

Posted on Sep 17, 2007

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How to power up a compaq 243890-001 power supply without the the motherboard? Its not green to ground

Remove Power Supply
1 . Shut down your computer and unplug the power cord and all cables connected to the system.

2 . Open the computer case and disconnect all power connectors from the motherboard, drives, cards and fans.

3 . Remove the four screws that secure the power supply to the case. These screws are located on the back of the computer case, at each corner of the power supply.

Wire and Start Power Supply
1 . Switch the power supply to the "Off" (sometimes "O") setting.

2 . Insert the end of one wire from a single pole, single throw (SPST) switch into the green wire of the ATX power connector (the largest power supply connector).

3 . Insert the end of the other wire from the SPST switch into the black wire of the ATX power connector. If your power supply has two black wires, connect the SPST to the black wire directly beside the green wire.

4 . Wrap electrical tape around the ATX power connector and wires from the SPST switch to hold them in place. Make sure there is no exposed copper or silver wire from the SPST switch wires.

5 . Turn the SPST switch to the "Off" position, if not already set. Plug the power supply into the wall outlet and switch it to the "On" (sometimes "I")setting.

6 . Connect any other computer components that you wish to operate without the motherboard, such as fans, drives or cards. Turn the SPST to the "On" setting to activate the power supply.

Hope the above information will be helpful to you.

Dec 01, 2010 | Compaq (243890-001) 250-Watt Power Supply

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My dell dccy will not power on. It was working fine and was powered off but will not power back on. I have checked the power cord. I have opened the case and reseated all connectors. Pushing the power on...

Yes, it's called bypassing the Power On switch. Has nothing to do with the switch itself, or it's wires.

You use a jumper wire on the 20 or 24-pin ATX main power cable's connector.
Touch the jumper wire from the Green wire (Soft Power On) to ANY Black wire. (Ground)
(Soft Power On is abbreviated as PS_ON)

If the Power Supply comes on, the problem is the Power On switch.
If the Power Supply does Not come on, the problem is the Power Supply.

1) 20-pin ATX main power cable,

2) 24-pin ATX main power cable,

Look at the photos of the ATX main power cable plugged into the motherboard.
Where the wires go down into the connector is the Back of the connector.

This is where the jumper wire goes down into.

The jumper wire goes down into the socket hole, in the Back of the connector, RIGHT NEXT to the wire IN the socket hole.
The jumper wire has to go pretty far down in the socket hole.

[ATX power cable plugged into the motherboard, Power Supply plugged into power ]

At the end of every wire in the ATX main power cable's connector, is a metal terminal.

A Female Molex Crimp Terminal connector,

[You can click on the Zoom In icon { + } at the top to enlarge the view]

The jumper wire Must touch that metal terminal.
The jumper wire is made from a straightened out paper clip, bent into a U shape.
The middle of the U is wrapped a few times with Black plastic electrical tape.
This where your fingers hold onto the jumper wire.

(One wrap of Black plastic electrical tape is good for 600 Volts DC)

One 'leg' of the U shaped jumper wire goes down into the socket hole with a Green wire.
The other 'leg' of the U shaped jumper wire goes down into ANY socket hole with a Black wire.
(ALL Black wires are Ground wires)

The contact period made is no longer than 2 seconds.

The Voltage is 5 Volts DC.
Two flashlight batteries produce 3 Volts DC.

This is one generic ATX power on switch that I have found fits many computers,


WATCH IT when buying an aftermarket Power Supply for your computer, if it needs one.
For a time period Dell was strictly a Proprietary computer manufacturer.
Dell wanted THEIR parts used in THEIR computers only.

They had the motherboard manufacturer switch the pins around in the ATX main power cable connector, on the motherboard.
They also had the Power Supply manufacturer switch the power cables around in the Power Supply.

This means if you plug an ATX main power cable, from an aftermarket Power Supply, into one of these proprietary Dell motherboards, you WILL fry out the motherboard!

Can also fry out the Processor, Ram Memory, and Harddrive. (Plus a graphics card if you have one installed)

CHECK the color code of the aftermarket Power Supply's ATX main power cable, to the color code of the Dell power supply.

See that the color code of the wires matches the socket holes in the connector.

Have further questions regarding this, post in a Comment.


Nov 29, 2010 | Dell System Power Supplies

2 Answers

The power supply came with no manual. There is no P IV power lead. There are two aux power leads. (1) four wire (O,B,R,Y) and (1) six wire lead (B,Y,B,Y,B,Y) The original power supply P IV lead has four...

As you've noted you need two Black wires (Ground), and two Yellow wires (12 Volt),
for a 4-pin ATX +12 Volt power cable,

If you are not using the 6-pin PCI Express power cable,

,rob the 4-pin ATX +12 Volt power cable connector, and wires from the old power supply.

Splice the wires of the 6-pin PCI Express to them.

Orange wires are 3.3 Volt
Red wires are 5 Volt
Yellow wires are 12 Volt
Black wires are Ground wires.

You need two Yellow wires, and two Black wires.

Or if you have a spare 4-pin standard Peripheral power cable from the power supply,

,buy and use an adapter power cable.

Nov 27, 2010 | Coolmax Technology COOLMAX M500B 500W EPS...

1 Answer

I want to convert this power supply for use with a battery charger for model aircraft. I need to know the color codes for the wires and also the pinout and which wire is the power on.

Pin Name Color Description
1 3.3V Orange +3.3 VDC
2 3.3V Orange +3.3 VDC
3 COM Black Ground
4 5V Red +5 VDC
5 COM Black Ground
6 5V Red +5 VDC
7 COM Black Ground
8 PWR_OK Gray Power Ok (is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation)
9 5VSB Purple +5 VDC Standby Voltage (max 10mA)
10 12V Yellow +12 VDC
11 3.3V Orange +3.3 VDC
12 -12V Blue -12 VDC
13 COM Black Ground
14 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
15 COM Black Ground
16 COM Black Ground
17 COM Black Ground
18 -5V White -5 VDC
19 5V Red +5 VDC
20 5V Red +5 VDC

/PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply's /PSON input to ground, thereby switching the power supply to full-on condition.
18 AWG is recommended for all wires except pin 11, which should be 22 AWG. For 300W configurations 16 AWG is recommended.
There are several ATX variants.
Hope this helps.
If this helps you resolve your problem, please
consider giving me a rating of 4.It will help me as well. Thank you.

Nov 26, 2010 | Compaq (243890-001) 250-Watt Power Supply

1 Answer

Where to plug case side fan

Pinout Pin number Wire color Description 1 yellow +12 volts 2 black ground 3 black ground 4 red +5 volts

Jan 27, 2009 | Okia / 450-Watt / ATX / 80mm Fan /...

1 Answer

Compaq dead after power company shutdown period

Sounds like a blown fuse in the psu, replace the unit and you should be good to go.

Nov 30, 2008 | HP ATX-250-12Z, ATX-250-12Z Rev. H1, HP...

1 Answer

Busted component

Getting a schematic is rather doubtful. You might be able to get a general idea of the circuit from somewhere on the 'net.

Was the power supply dead?

ATX style power supplies have both a standby and main section. The standby supplies a low current +5 volts to a small portion of the motherboard.

If the component failure is in this section, this standby voltage will be missing or incorrect, and the computer will be dead- won't power on at all.

I've seen a number of catastrophic failures in this standby circuit, and repair isn't suggested or economically feasible, especially as some parts often poof beyond identification.

When the pwr button is pushed, the main section comes on, and supplies +5 (Red wires), +12 (Yellow wires), +3.3 (Orange wires), -5, -12. Look here for this info

Voltages are precisely regulated, and any substantial deviation (more than a few 10ths of a volt) indicate a problem, especially on the +5 & +3.3 lines.

Jul 07, 2008 | Okia / 450-Watt / ATX / 80mm Fan /...

1 Answer

Power supply

Is this by chance a computer power supply? Does the computer come on when the power button is pushed? If so, then the fan itself is bad- bearings are stuck/lubricant dried up etc. Replacement fans are readily available at low cost.

if the power supply is dead, then likely an internal component has failed. If you have some tech savvy, a voltmeter, soldering/desoldering items & skill, you may be able to repair the supply. A very common failure is one or more electrolytic capacitors, and these may show visible signs of failure- bulged out end, and/or leakage.

ATX style power supplies, used in most machines of the past 8-10 years have both a standby and main section. The standby supplies a low current +5 volts to a small portion of the motherboard. When the pwr button is pushed, the main section comes on, and supplies +5 (Red wires), +12 (Yellow wires), +3.3 (Orange wires), -5, -12. Look here for this info

Voltages are precisely regulated, and any substantial deviation (more than a few 10ths of a volt) indicate a problem, especially on the +5 & +3.3 lines.

Anyway, you could make these checks. Replacement electrolytics- use the Panasonic FC series (designed for switching power supplies) available from Digi-key electronics, or equivalents (Mouser electronics another possible supplier).

Jul 05, 2008 | Compaq (243890-001) 250-Watt Power Supply

1 Answer

Pc no start.........

You might have a bad power supply. If you have a voltmeter, check the voltage of the standby power supply. This voltage is present even if the system is off, plugged in. It powers a small portion of the logic circuit. It should measure within a couple of tenths of exactly +5 volts. If it is low, or high, this will prevent turn-on. The purple wire of the 24 pin connector is what carries this to the motherboard. The color coding layout is found at If by chance this voltage is OK, then check the full on voltages also. Repair of the defective supply is probably by replacement of one or more small electrolytic capacitors in the appropriate circuit, especially if you are technically savvy. Capacitors are available through several suppliers; Digi-Key supplyies Panasonic FC series which are suitable for switching power supplies. Or, you may just replace the whole unit.

Apr 24, 2007 | HP and Compaq Pavilion Replacement 200w...

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