Question about Antec Power Supplies: SP350 SmartPower 2.0 350W 24/20/6-pin 4-SATA Power Supply (PSANSP350) Power Supply

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When I first turn on the power supply the CPOU fan turns on for about 5 seconds. Then the entire computer will not turn on by the power switch although there are green light on the mother board and the Network Card that are lite. I think iit may be the power supply but I am told it could also be the mother board????

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  • Antec Master
  • 27,725 Answers

Test your PSU or replace it
Test all leads that attach to your hard drive including electrical extensions,IDE,SATA and
the leads from your motherboard to your hard drive make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
good luck

Posted on Aug 25, 2010

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Compaq Presario SR1050NX Won't Turn On. . .


You're typing like you have been working tirelessly on the problem.
In fact there is no user name, lol!

Okay.....relax...........just ease back, and put your hands behind your head, and close your eyes.............think about clouds floating across in the sky.

Better?

Alright.

Your Power Supply is bad. Weak voltage power rail.
Replace it.

Don't think so? Cool.

That's what I'm here for. To teach.
Have a multimeter?

A) If ALL of the LED's were on they would use less than 1 Watt of power.

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

C) A typical Processor can use 51 to 125 Watts of power. Just depends on what Processor it is.

(Older Intel Pentium I, II, and III, uses less than 51 Watts. Some older AMD's do also)

Primer:
You press the Power On button. The plastic assembly of the Power On button in turn presses against a Power On switch,

http://www.directron.com/atxswitch.html

The Power On switch is a Momentary Contact Switch.
When briefly closed the Power On switch completes a circuit.
The Soft Power On circuit.

When the Power Supply is plugged into power, there is a constant 5 Volts (DC) present.
The 5 Volt Standby power.

Pressing the Power On button redirects the 5 Volt Standby power, in the Power Supply. This 'excites' the Power Supply, and turns it on.
(Soft Power On circuit)

The first chipset (I.C.) to receive power is the BIOS chipset.
The Basic Input/Output System program is initialized.

BIOS looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the Operating System.

(WinXP and Win7 are two examples of an O/S)

Primer over.

1) http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&dlc=en&lang=en&lc=en&product=405454&

2) http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00595250&tmp_task=useCategory&cc=us&dlc=en&lang=en&lc=en&product=405454

FOLLOW Anti-Static Precautions

2a) http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=125&prodSeriesId=3433073&prodTypeId=12454&objectID=c01358034

(Yes, I know. Slightly different computer case. Principles still apply)

3) Don't think you will be hearing any BIOS Beep Codes, because there isn't enough power, lol!

For additional questions please post in a Comment.
Regards,
joecoolvette

(If Power Supply power were dynamite, your Power Supply wouldn't have enough power to bl-ow it's nose)

Aug 28, 2012 | Compaq Presario SR1050NX (DW257A) PC...

1 Answer

Processor fan is very noisy from start up to all the time I am on line.


Hi,

Good day , you may need to power-off her PC, open it up, and give it a good cleaning with a vacuum cleaner. If possible, after you've got her PC open, and before you clean it, turn it back on so you can figure out which fan is causing the noise problem (many PCs have more than one fan). If it's the CPU fan, then you're going to want someone who is comfortable and experienced with removing it and replacing it with a new one, because it is EXTREMELY important to get 100% physical contact between the CPU chip itself and the cooling fan/housing that is attached to it, or the CPU is going to overheat and destroy itself within seconds of being turned back on. If the noise turns out to be from a normal case cooling fan (3-5 inches across), you can try cleaning it really well to remove any dust, and see if that fixes the problem. If not, you can buy a replacement fan of the appropriate size at pretty much any PC store for $5-$20. It takes 5-10 minutes to unscrew the old fan and install the new one, and just use the same electric wire from the old fan for the new fan.
If the noise turns out to be from the computer's power supply, you cannot repair it, so it needs to be replaced. I would recommend either replacing it yourself, or having someone who has done it before replace it for you. There's usually only 4 screws that hold the entire power supply box in the case, and then you also have to unplug the power cords that go from the power supply to the hard drives, floppy drive, CD drive, other internal peripherals, motherboard, and fans. Carefully remove the entire power supply box from the PC case, being careful to not scrape it or bang it against any of the memory cards or other internal components. Take the noisy power supply with you to a discount computer store and find a new power supply that's the same physical size and at least as many watts as the current one (usually 350-500 watts). If you go with a generic power supply, it will probably cost around $30. If you go with a name brand, high-wattage power supply, it can cost $100 or more. Hope this information help you in resolving your issue. Have a great day.

May 23, 2011 | Computers & Internet

2 Answers

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.
Thanks.

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

2 Answers

When the computer on/off button is pressed , the CPU fan and tower exhaust fans start running, the blue light around the power button does not light and the boot up process goes no further. Fans continue...


A) When you hold a Power On button, (Switch actually), in for a count of 10 seconds, it turns the computer off.

(There is a Power On switch, located behind the plastic Power On button. Usually, the Power On switch snaps into the housing of the plastic Power On button.

Example of a typical ATX Power On switch,

http://www.directron.com/atxswitch.html

The Power On switch turns the Power Supply on.

Old computers had a metal rod, that when the Power On button was depressed, the button pushed against the metal rod, which in turn pressed against a power switch located inside the Power Supply.

The design after that, was a power switch located in the Front Panel. (Plastic front of the computer) A large cable, (Wire) ran from the switch to the Power Supply.

Now there is the Soft Power On feature. (PS_ON)

The Power On switch is a small Momentary Contact Switch. Pressing it closes a circuit. The Soft Power On circuit.

When a power supply is plugged into power, there is a constant 5 Volts (DC) present.
This is the 5 Volt Standby.

Closing the Soft Power On circuit, redirects the 5 Volt Standby power to a circuit within the Power Supply.
This in turn 'excites' the Power Supply, and turns the Power Supply on.

Sorry to be windy, but I wanted you to know how the Soft Power On feature works )

eMachines are a budget computer. As such they save the consumer money.
However in order to do this, the manufacturer will install low quality parts, in some areas of the computer.

One such part is the Power Supply.

1) ALL the LED lights combined use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts

3) A typical Processor can use 51 to 125 Watts.
Depends on what Processor it is.
(Had you stated the Model Number I could have told you)

Enough power to spin fans, but not enough to spin fans, AND turn the Processor on.

Do you have access to another computer that is unused, but has a Known to be good, Compatible power supply?
It could be used for a test unit.

Tell me the Series, and Model Number of your eMachines, and I'll tell you what Wattage it should have, and what power cables, for the Power Supply.

(Some examples of Series, and Model Numbers, T1090, E4264, W2925, and so on. The T, E, and W are a few examples of the Series letter.
The numbers following the Series letter, is the Model Number)

If you wish I can direct you in removing the Power Supply, and installing the test unit. (And/Or a new Power Supply)

Sep 12, 2010 | E-Machines eMachines Desktop PC

1 Answer

The controller will not turn on. Green light on back comes on but when we turn on the unit, the fan starts briefly and then the power cuts off.


Bad Power Supply. Weak Voltage power rail.

Not enough power to turn the Processor on, and keep it on.

1) ALL those LED lights together, use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts

3) A typical Processor can use 51 to 125 Watts. Depends on what Processor it is. (Older Processors use less Wattage)

The Compaq Presario SR1810NX desktop computer, comes with an AMD Sempron 3200+, processor.

(Uses the Socket 939 processor socket)

[Maximum operating capability is a 1.8GigaHertz frequency rate.
1.8GHz

Giga = Approximately 1 Billion
Hertz stands for Cycles per Second.
Frequency Rate is correct computer speak for 'Speed'
The AMD Sempron 3200+ processor, can operate at a maximum frequency rate of 1.8 Billion Cycles per Second ]

HP Support >Compaq Presario SR1810NX desktop computer > Product Information > Product Specifications,

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00609384&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&product=1841795&lang=en

The AMD Sempron 3200+, can use up to 62 Watts,

http://en.wikipedia.org/wiki/List_of_AMD_Sempron_microprocessors#.22Palermo.22_.28Socket_939.2C_E3_.26_E6.2C_90_nm.29

(Palermo Core)

When you press the plastic Power On button, you are contacting a Power On switch inside it.
(Typical ATX Power On switch,

http://www.directron.com/atxswitch.html )

When an ATX power supply is plugged into power, there is a 5 Volt Standby power, present inside the power supply.

Pressing the momentary contact power on switch, closes a circuit that directs the 5 Volt Standby power to 'excite' the power supply, and turn it on.

The first chip to receive power is the BIOS chip.
[Chip and Chipset are slang terms for I.C.
Integrated Circuit.
BIOS stands for Basic Input/Output System]

BIOS,

http://en.wikipedia.org/wiki/BIOS ]

BIOS looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the Operating System.
(Windows XP is one example of an O/S. Operating System)

The LED lights receive power, so do the fans, and the Harddrive. When it's time for the Processor to kick on, there isn't enough power, and the Power Supply 'falls to it's knees'.

Replace the Power Supply.
It's just one of the basic ATX power supply's that are readily available in a multitude of places.
The Wattage is 300 Watts.

The ATX form factor for this power supply, (Size and shape), is approximately 6 inches Long, 6 inches Wide, and 3-1/2 inches Tall.

Power cables needed:
(Continued in a Comment)

Aug 02, 2010 | Compaq Presario SR1810NX Sempron 3200+ 1.8...

2 Answers

Acer Aspire L100 will turns on but never boots to windows


not the power supply...recommend reinstalling windows

Aug 02, 2010 | Acer Aspire L100 PC Desktop

2 Answers

Blue button flashes and green light in the back stays on. When I unplug power source, the blue light still flashes for another 10 seconds. When it shuts off completely, I plug it back in--then it...


Power Supply failure. Weak Voltage power rail.

Blue light in the front is the Power On LED light. Green light in the back is on the Power Supply.

Primer:

When a Power Supply is plugged into power, there is a 5 Volt Standby power present in the Power Supply.

When you press the Power On button, this in turn presses against a Power On switch.

The Power On switch is located inside the plastic Power On button.
This is a basic example of a Power On switch,

http://www.directron.com/atxswitch.html

Pressing the Power On switch closes a circuit for the 5 Volt Standby power.
The 5 Volt Standby power is then directed to a circuit inside the Power Supply.

This action turns the Power Supply on.
Power then goes from the Power Supply to the motherboard.
The first chip to receive power is the BIOS chip.

[Chip and Chipset are slang terms for I.C.
Integrated Circuit,

http://en.wikipedia.org/wiki/Integrated_circuit

BIOS = Basic Input/Output System ]

The BIOS chip has the BIOS program burned into it.

BIOS, (The BIOS program), looks to see what devices are installed, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the operating system.

(Windows XP is one example of an O/S. Operating System)

Secondly,
1) ALL of the LED lights, use less than 1 Watt of power from the Power Supply.

[ The HP Pavilion a1250n desktop computer, comes with an ATX style of Power Supply, which has a reported Maximum Wattage rating of 300 Watts]

2) EACH fan uses 2 to 3 Watts

3) A typical Processor uses 51 to 125 Watts. Depends on what Processor it is.

[The HP Pavilion a1250n comes an AMD Athlon 64 X2 3800+
This particular Processor uses (Fits into), a Socket 939 processor socket.

The Athlon 64 X2 3800+ can use up to 89 Watts.

http://en.wikipedia.org/wiki/List_of_AMD_Athlon_64_microprocessors#Athlon_64_X2

Look under TDP.

This is what a Socket 939 processor socket looks like,

http://en.wikipedia.org/wiki/Socket_939 ]

You have enough power to light those simpy LED lights, and spin the fans a few times, but not enough power to Turn the Processor on, and keep it on.

No Processor running, No computer.

What causes Power Supply failure?

1) Computer is dirty inside, as well as inside the Power Supply.

In reference to the Power Supply;
The Power Supply used in your computer is an SMPS.
Switched-Mode Power Supply.

http://en.wikipedia.org/wiki/Smps

There are two cooling components,
A) The Fan
B) Heatsink's which are used internally. (Inside)

[Typical construction of a Heatsink is a plate of metal with tall, thin fins protruding from it.
The plate of metal absorbs heat, from whatever object it is placed against.
The tall, thin fins absorb the heat from the plate of metal, and radiate the heat away.

If a fan is used in conjunction with a Heatsink, the air flow from the fan goes in-between the fins, and around the fins, and help to dissipate, (Carry away), the heat ]

When the Fan's blades, center hub, and surrounding cage (Shroud) are clogged with 'Gunk', the Power Supply heats up.

Heat = Wasted Energy

The more heat, the more the Power Supply strains to keep up with the call for power.
Eventually components inside the Power Supply fail, and the Power Supply fails.

2) Low quality Power Supply.
Low quality components are used in the Power Supply

The ATX style of Power Supply is used in a Large percentage of computers out there.
Very readily available.

I would suggest you install a Power Supply with more Wattage.
A computer only uses the power it needs, and NO more.
Won't hurt your computer.

Will help your computer as there will be less strain on the Power Supply.
Also the 300 Watt rating on that Power Supply is bunk.
Padded rating to make the Power Supply look better than it is.

The actual Wattage rating, is more like 60 to 70 percent of what is stated.
(180 Watts to 210 Watts)

Need help in opening your computer case, and replacing the Power Supply, and/or a recommendation for a Power Supply, let me know in a Comment.

[BE SURE to follow Anti-Static Precautions, BEFORE you reach inside your unplugged from power, computer ]

Jun 26, 2010 | HP Pavilion a1250n (EG194AA) PC Desktop

1 Answer

I have a Okia 420ATX power supply. I had it


Based on the additional information that the power supply fan turns on for a few seconds and then goes off indicates to me you have a motherboard or processor problem. I would have a service center check the computer for you.

Feb 03, 2010 | Okia 420w UL Approved ATX Computer Power...

1 Answer

My computer freezez and then it is unresponsive when I press the power button so I have to turn of the power manualy at the plug. It just happens for no apparent reason. Scanned HDD and memory for errors....


it may be the ram thats faulty or it is your cpu overheating, remove the cpou place new thermal paste, then replace, add more fans also, it will work

Oct 10, 2009 | Asrock 775VM800 Motherboard

2 Answers

Front panel Ac Switch failing to start computer.


Try these steps.
If Power supply light does not turn on (or no power supply LED)
Perform the following steps, in order, until power is restored or it is determined that there is a hardware failure:
NOTE: If the Power Supply fan spins when the PC is turned on but the light does not come on, it is possible the LED is defective. If this is the case, use the section Power supply light comes on or flashes .
1. Disconnect everything from the PC, including the power cord.
2. With the power cord disconnected, press the power button on the front of the computer. Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
3. Replace the power cord with another power cord, like the one used by the monitor.
Test to see if the computer can turn on. If not, continue using these steps.
4. Ensure that the voltage selector switch is on the correct setting, 115V for North America.
5. With the power cord removed, flip the red voltage selector switch to the opposite position, wait about five seconds, and then switch the red voltage selector switch back to its original location.
This ensures that the voltage switch is engaged and set correctly for your country/region.
6. Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
7. Plug a lamp into the same outlet to see if the wall outlet has power. Try the computer in a different outlet in order to eliminate the outlet as a possible source of the issue. Test both to see if the wall outlets have power.
8. Remove all extension cords, power strips, surge protectors and any converters that remove ground. Plug the power cable directly to the wall outlet. Test for power. If this fixes the issue, find the device that is causing the issue and do not use it.
9. Use a vacuum cleaner to remove the build-up of dust from the power supply fan vent holes. Make sure that the PC is turned off and that the power cord is plugged into a grounded outlet. Only use the end of the vacuum hose near the outside of the fan entrance.
Plug in the power cord and test to see if the computer can turn on. If not, continue using these steps.
10. If all of the above steps have been tried and the power supply light remains off, use the steps in the next section, use the next section Power supply light comes on or flashes , to reseat the cables and check the power switch connector.

Jan 11, 2009 | Compaq Presario SR1000T (568657) PC...

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