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My DP8240 poes not power up. I have checked the power supply and it is delivering 12.3 volts.

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If there is a standby light or indicator try unplugging the power supply and then pressing power on. Leave it unplugged for several minutes (a full 10 minutes is best) then try plugging it in a starting it again.
If there is not standby or ready light when it is plugged in try replacing the fuses in the device.
Let us know if this works or not and we can suggest some further steps.

Posted on May 02, 2008

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Posted on Jan 02, 2017

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Will the PoE Function of S2700/S3700/S5700 PoE Switches Be Affected When a 110 V Power Source Is Used?


When using Huawei power supply units, Huawei fixed switches supports 110 V AC input power. The power consumption of most powered devices (PDs) is 4 W to 5 W; therefore, 250 W and 500 W power supply units can provide sufficient PoE power for PDs.
NOTE:
All fixed PoE switches except the S2700-9TP-PWR-EI, S2750-20TP-PWR-EI-AC, S2750-28TP-PWR-EI-AC, S2751-28TP-PWR-EI-AC, S5700-10P-PWR-LI-AC, S5700-28P-PWR-LI-AC, S5700-28TP-PWR-LI-AC, S5700S-28P-PWR-LI-AC, S5701-28TP-PWR-LI-AC, S5700-52P-PWR-LI-AC, S5700-28X-PWR-LI-AC, and S5700-52X-PWR-LI-AC support double PoE power supply units.

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The power devices that Cisco Catalyst 2960 Series Support?


The Cisco Catalyst 2960-48PST-L can support 48 PoE ports with total PoE power output capacity at 370W. Taking advantage of Cisco Catalyst Intelligent Power Management, the Cisco Catalyst 2960-48PST-L configuration can deliver the necessary power to support 24 ports at 15.4W, 48 ports at 7.7W, or any combination in between.

The Cisco Catalyst 2960-24PC-L can support 24 simultaneous full-powered PoE devices at 15.4W for maximum powered-device support.

The Cisco Catalyst 2960-24LT-L can support eight PoE devices at 15.4W
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Where do the p3,4,5and 6 go in the computer


If you go to the Dell support site you can download the manual.

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No power to starter starter is good


Confirm power is availible at starter main power supply, step one , using mutl meter check for 12 volts at battery positive terminal , 2, check main voltage supply lead to starter from battery pos post , 12 volts present? yer check voltage supply lead from battery pos post to altenater , then to starter , 12 volts present, yes , check small wire to starter at starter for switched 12 volts present yes change stater after confirming suitable ground, no, trouble shoot ignition / starter switch in colume

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What is the sqare chuck , wires two black and two white wires on the motherboard ?


Boy, ya got me.

If it was a small square opaque white socket on the motherboard, that a power cable from the Power Supply; had two YELLOW wires, and two Black wires, and plugged into it, I would know what it is,

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

As technology for personal computers advanced, hardware components needed more power.
The motherboard wasn't able to deliver the power needed, so the 4-pin ATX +12 Volt power cable, was brought out.

More power was needed later.
Hardware components demanded more power, than a 4-pin ATX +12 Volt power cable could deliver.

So the 8-pin EPS +12 Volt power cable was brought out,

http://www.playtool.com/pages/psuconnectors/connectors.html#eps8

It CONNECTS to the motherboard. (For motherboards that use one)
NOT to be confused with the 8-pin PCI Express power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress8

This power cable plugs into a GRAPHICS CARD, not the motherboard. Note the color code of the wires.

For a PCI Express expansion slot on the motherboard, for a graphics card; the best the PCI Express slot can deliver is 75 Watts.

The 6-pin PCI Express power cable was brought out next,

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

It is plugged into the graphics card too, and can deliver up to an additional 75 Watts.
Now there is 150 Watts available for the graphics card.

Computer technology advanced, and the 6-pin PCI Express power cable, couldn't deliver the power needed.

Now comes the 8-pin EPS +12 Volt power cable.

The 8-pin EPS +12 Volt power cable by itself, can deliver up to an additional 150 Watts.

Now there is 225 Watts available for a graphics card.
75 Watts from the motherboard, 150 Watts from the 8-pin EPS +12 Volt power cable.

Color code of wires;
1) Orange = 3.3 Volts
2) Red = 5 Volts
3) Yellow = 12 Volts
ALL are DC Voltage

(Two flashlight batteries produce 3 Volts DC)

4) Black wires are Ground wires. Also are known as Negative wires.


This motherboard happen to have a manufacturer name, and Model Number?

Can't find it?
How about the computer manufacturer name, and model number, it came out of?

The model number for a desktop computer, is on the back of the computer, next to the Windows product key; or up on the side of the computer tower.

(The plastic front of a desktop computer is the Front Panel.
Some older computers had a Door in the Front Panel.
The door is opened, and you look inside -> Down, for the model number)

Post back in a Comment.

Regards,
joecoolvette

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

Feb 08, 2013 | Computers & Internet

1 Answer

New GA-990AX-UD3 motherboard will not boot


You really should take that Power Supply, and use it on grandma's computer.

The 8-pin EPS +12 Volt power cable was brought out, to provide more power To the motherboard AND processor.

http://www.playtool.com/pages/psuconnectors/connectors.html#eps8

The 4-pin ATX +12 Volt power cable has TWO yellow wires.
Yellow wires are 12 Volt wires. (And two Black ground wires)

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

The 8-pin EPS +12 Volt power cable has FOUR 12 Volt wires.

In the motherboard manual, does it say, "Yes Tom. Go ahead and use a 4-pin ATX +12 Volt power cable. We don't care. We just use an 8-pin EPS for fun."

[ This is an 8-pin PCI Express power cable. Completely different,

http://www.playtool.com/pages/psuconnectors/connectors.html#pciexpress8 ]

The motherboard probably uses 150 Watts by itself.
No Ram Memory, no CPU, no fans, etc.

The CPU could use up to 125 Watts of power. Just depends on what AMD, socket AM3, processor you are using.

Now to graphics card's power;
The most Wattage a PCI-Express x16 slot can deliver is 75 Watts.

The most power a 6-pin PCI Express power cable can deliver is 75 Watts.
8-pin EPS +12 Volt power cable? 150 Watts.

When buying a Power Supply you should calculate all components needing power,

http://extreme.outervision.com/psucalculatorlite.jsp

,then buy a Power Supply that has AT LEAST 10 percent more power than needed. Easier on the Power Supply.
Also a computer will NOT use more power than it needs.

10,000 Watt power supply, (Exaggeration ), and the computer only needs about 100 Watts for surfing the internet?

Computer ONLY uses 100 Watts.

Due to the price, the above, and the availability, you should use a 500 Watt power supply at least.

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=899123&CatId=1079

http://www.amazon.com/StarTech-6in-Pin-Power-Adapter/dp/B002O21XHQ

Or use it on yours if it has enough Wattage.

Back in the day, the motherboard didn't need to supply that much power to components on it.
More powerful Processors, Ram Memory, and graphics cards, brought the power needed, up.

A 4-pin ATX +12 Volt power cable was added for the motherboard. Then 6-pin PCI Express power cable for graphics cards. Then the 8-pin PCI Express power cable for graphics cards. Lastly the 8-pin EPS +12 Volt power cable.

(Better make sure the Power Supply you have is good, if you wish to use the above power adapter cable. Nothing like having a Power Supply with a weak voltage power rail, and a new build, to pull your hair out on )

http://www.gigabyte.com/products/product-page.aspx?pid=3894#ov


Out of the motherboard manual Page 23,

"With the use of the power connector, the power supply can supply enough stable power to all the components on the motherboard. Before connecting the power connector, first make sure the power supply is turned off and all devices are properly installed. The power connector possesses a foolproof design.

Connect the power supply cable to the power connector in the correct orientation. The 12V power connector mainly supplies power to the CPU. If the 12V power connector is not connected, the computer will not start.

To meet expansion requirements, it is recommended that a power supply that can withstand high power consumption be used (500W or greater). If a power supply is used that does not provide the required power, the result can lead to an unstable or unbootable system."

For additional questions please post in a Comment.

Regards,
joecoolvette

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I was curious, if i put my 2055 scanner on 12 volts, instead of the required 13 volts, will it hurt it?


You won't damage anything with 12 volts. Equipment built for use in automobiles will often have a DC input marked 13.8 volts because it's the voltage delivered by a fully-charged battery. But any supply around 12 volts will work. Just be sure the supply has enough current available (around an amp should be fine for a scanner), and that you get the polarity right when connecting it.

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I have a 14 volt source but when I try the winch in either forward or reverse the voltage drops to 4 volts. The drum is not seized because you can pull the cable out easily by hand.


Not only do you need a 12 volt supply (13.8V) to operate this winch, but you also need a.) wire large enough to carry the electrical load, and b.) a power source that has the necessary current (amps) to turn the motor.

If you have wires that are too small, they will heat up and not be able to deliver the current (amps) required by the motor. If your power source is to small - it can not supply the current required. The result of either conditions is "voltage drop". This can be explained the same way your car needs a 12 volt car battery to start. If that car battery was dead, you couldn't connect eight "D" cell batteries (8 x 1.5volts = 12 volts) together and attach to the car's battery cables and expect it to start. This is because the amount of current available in the car battery is hundreds of time greater than eight "D" cell batteries - even though when the D cells are connected in series - both systems deliver 12 volts.

If neither of the above conditions is present, then there could be an electrical problem with the drive motor itself. This could be a shorted / melted winding or other electrical connection that is not right, even if the drum spins freely.

Apr 04, 2011 | Electric Superwinch LP8500 Series Utility...

1 Answer

I am trying to add an additional PoE device, put it will not power up. How can I tell the switch to power up a specific port, or put the switch into automatic mode?


Are you within the power budget?

Power feeding of Ethernet is limited for fixed 10BASE-T/100BASE-TX ports. The solution can provide maximum output power per PoE port up to 15.4W on 12 ports or 7.5W on 24 ports simultaneously. The Switch provides independent overload and short-circuit protection for each port, LED indicators for power status per PoE port, and supports IEEE802.3af MIB for Power over Ethernet functionality.
For each attached 802.3af-compliant device, the Switch automatically senses the load and dynamically supplies the required power. The Switch delivers power to a device using the two data wire pairs in the twisted-pair cable. Each port can provide up to 15.4W of power at the standard -48 VDC voltage.

Source: http://www.cisco.com/en/US/products/ps9967/products_qanda_item09186a0080a36afb.shtml

Mar 19, 2011 | Cisco Systems 24-Port SF 300-24P 10/100...

1 Answer

The green power light on the PSU is on but the machine will not power up PSU is an HP5188-2627. The machine (HP m7580uk) has been on for an extended period of time but was working fine until it was finally...


Power supply failure, or the Power On switch. (Behind the Power On button)

My money's on the power supply failure.

Why?
It's the leading case of computer failure. The power supply is the 'Heart' of a computer. (Processor is the 'Brain', Motherboard is the 'Building Block')

Computer was on for an extended length of time? Was the computer ever turned off, and the inside of the computer cleaned out on a regular basis?
(Power supply also)

Normal procedure is to unplug the computer from power, open the computer case, and use a can of compressed air for computers.

Power supply light is on?
This is what is going on.

Computer power supply's are rated in Wattage, for power.
Voltage times Amperage = Wattage

The HP 5188-2627 power supply, supplies three main voltages. It has three main voltage power rails.

1) The 3.3 Volt rail
2) The 5 Volt rail
3) The 12 Volt rail

Your power supply has a weak voltage rail.

A) ALL the lights use less than 1 Watt of power.
B) EACH fan uses 2 to 3 Watts
C) A typical Processor uses 55 to 125 Watts.

There isn't enough power from the power supply to turn the Processor on.

Solution is to replace the power supply.
It may seem a little daunting for someone replacing a computer power supply, the first time.

After you have replaced one, it becomes easier.
Essentially you are just opening the computer case, unplugging the power cables from the power supply to the various hardware components, and removing the power supply.

To install just reverse these steps.

The power supply in your computer is a 300 Watt power supply. (Maximum wattage)

The size, and shape of the power supply, is one that is used in over 90% of personal computers.
ATX

What I would I recommend for a replacement?
Not one of the cheap quailty Hi-Pro's that HP used, that's for sure!

An OCZ StealthXStream 400 Watt is what I would recommend.
Why?

1) It will fit
2) It has a 140 Millimeter fan compared, to the 80mm fan that your old power supply has.

A larger fan means it will run quieter, due to the fact that it won't have to turn as fast, in order to put out as much air.
Will actually put out more air than that 80mm fan, and will spin slower.

3) Has two 12 Volt power rails.
One 12 Volt rail can deliver 17 Amps.
The other 12 Volt rail can deliver 14 Amps.

You can add the two 12 Volt power rail Amp's together, for 31 Amps.

Means less strain for the power supply, to keep up with the tasks.
(Your old power supply probably has an 18 Amp, 12 Volt power rail)

4) Has all the power cables you'll need.

5) Price, and reliable quality.

This is one place that carries them,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4675269&CatId=1078

There are other places also. Not advertising for the above website, nor the power supply manufacturer.
Just my personal preference, based on experience with both.

A computer only uses the power it needs, and NO more.
If you install a 1000 Watt power supply in your computer, and the computer only needs 100 Watts, it only uses 100 Watts.

(Surfing the internet typically uses 100 Watts of power. Like a 100 Watt light bulb)

This may help guide you in replacing the power supply,

http://www.hardwaresecrets.com/article/362

Jan 03, 2010 | Computers & Internet

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