Question about Enermax (by Coolergiant) ELT400AWT Liberty (Lowest Noise) 400W ATX /BTX Power Supply ATX 12 Ver 2.2 ... (CSPSEM400AWT) Power Supply

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No power to 12 volt, Hard drive, or Disk drives.

I install it plug in 20 pin, 12 volt and the three drives, turn on the PC and it will not boot up my drives all it runs is the fans and I need it to run my 7950GT PCI-e x16 card. I have a Foxconn C51GU01 MB which only requires 300W to run... I am at a loss and joensin to try out my new card. Any help would be greatly appreciated.

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Re: No power to 12 volt, Hard drive, or Disk drives.

Retrace your steps there may be a loose wire(s). Have you checked and rechecked your pinouts? maybe one of the wires is backwards. Hate when that happens. It could be bad out of box. Try unhooking everything then one by one rehook your components. Maybe by terrible coinsidence a part fried and is preventing the machine from booting. Make sure your CPU fan is plugged in. I am installing a new motherboard now and those are the pitfalls I keep track of.

Posted on Mar 08, 2007

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How to install

HP Support > Pavilion a1630n Desktop PC > Main Support page,

Took you this way in case you need additional information, and software; in the future.

No, replacing the Power Supply is not listed.

In the list click on the blue - How To
Now on Adding/Replacing Hardware.
Opening the PC Case

BEFORE working inside your computer, follow Anti-Static Precautions.

Your body carries Static electricity. Static WILL fry out (Short Circuit), the delicate hardware components inside a computer.
Relieve your body of Static.

Computer ON a table, computer unplugged from power, computer case open;
TOUCH an unpainted surface of the metal frame, of the open computer case.
This action will relieve your body of Static.

IF you leave your computer in the middle of working on it, be SURE to Touch the metal frame again upon your return.

1) Remove ALL cables. If you are not EXACTLY aware of where each cable goes, suggest making a drawing, and notes; as to where each cable goes before removing them.

2) Suggest lay a static free towel on the table you're working on, and lay the computer on it's side; opening of computer case -> Up.
Towel/cloth helps prevent scratching the table, and the computer.

Much easier to work on the computer this way, IMHO.

3) The plastic 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.

(Power On switch, Power On LED light, Harddrive activity LED Restart switch; IF used)

The Front Panel header pinout is NOT listed. I THINK I know where the wires go. The Front Panel header pins. I do NOT know the color of the wires, though.
When replacing a Power Supply wires get bumped, and may get accidentally disconnected.
Suggestion is you make a drawing, and notes for the Front Panel header, and color of wires; also.

Also for the headers going along the bottom of the motherboard.
Better to safe, than trying to figure it out later.

4) The Power Supply has a Form Factor. This term was used strictly for motherboards, but has gone also to the Power Supply, and Computer Case.

The Form Factor for your Power Supply is ATX.
The term refers to the size, and shape of the case; and the power cables.
Size is approximately 6 inches Wide, 5.5 inches Long, and 3.5 inches in Height.
(152.39mm Wide x 139.7mm Long x 88.89mm Height)

It is a generic unit made by Bestec, HiPro, or Delta.
Maximum rated Wattage is 300 Watts.
(ACTUAL wattage is more like 60 to 70 percent, of what is stated.
180 to 210 Watts!)

This is JUST a look at an example. Not advertising,

By the photo you can see the type of power cables, and number used.

If I were recommending a replacement Power Supply, I sure would not recommend the above example.
A) Low quality Electrolytic Capacitors
B) Low quality Rectifier Bridge
C) Low quality MOSFET's
D) Low quality wiring; too small in gauge size

The above example gives a true 350 watts. Has all the power cables you'll need, an extra ones.

Suggest you find a Power Supply comparable to this one, when replacing.

Here's a look at your motherboard,
(Product information > Product specifications > Motherboard Specifications - A8M2N-LA (Nodus M3)

5) There are TWO power cables from the Power Supply, that plug into the motherboard;

A) 24-pin ATX Main power cable;

Looking at the motherboard photo, this power cable's connector, is all the way to the right/middle of the motherboard.
It is the whitish long connector that has two columns of 12 socket holes.
This is a general example of the power cable, and it's respective connector on the motherboard. NOTE* Color of connectors does NOT matter,

Note the power cable connector's Lock on the side, shown in the middle photo, and photo to the right.
The Lock is hinged. Operates like a see-saw on a playground.
The Top, or part that is closest to the wires; is squeezed in with the fingers, and thumb.

This action brings the hooked end at the bottom, away from the Lock Tab, on the motherboard's female connector.
Now the power cable's CONNECTOR, can gently be wiggled, and pulled up on; with the Lock depressed.

(ONLY use the connector when disconnecting a cable. DO NOT pull on the wires)

The Power Supply I referenced as a recommendation, and all new Power Supply's; have a 20 + 4-pin ATX main power cable.

This type of power cable connector was brought out, so that the Power Supply could be used on motherboard's that required a 20-pin ATX main power cable; or a 24-pin ATX main power cable.

Either use the extra 4-pin power cable to make a 24-pin model; or don't, to have a 20-pin model. YOU will use the 20-pin AND the 4-pin power cable - together.
General example of said cable,

NOTE the color code of the wires, in the additional 4-pin power cable.
Two Yellow (12 Volt), One Red (5 Volt), and One Black. (Ground)

B) The second power cable going to the motherboard, also has this type of Lock;
The 4-pin ATX +12 Volt Power cable,

NOTE the color code of the wires.
Two Yellow (12 Volt), two Black. (Ground)

You cannot mix the two power cables up, because the connectors are different, but wanted you to be aware of their likeness.
[4-pin ATX +12 Volt power cable, and 4-pin power cable for 24-pin ATX Main power cable)

Looking at the Top/Left in the motherboard photo, the square whitish 4-socket hole connector; is for the 4-pin ATX +12 Volt power cable.

6) Looking at -
HP Pavilion Media Center a1630n Desktop PC Product Specifications; tells me there is a SATA harddrive used, and a SATA optical drive,

Harddrive - 250GB SATA / 7200 rpm

16X DVD (+/-) R-RW RAM (+/-)R DL Lightscribe drive, is the optical drive.
Lightscribe was developed to be used on SATA optical drives. (CD/DVD drive)
Therefore I conclude it is a SATA optical drive.

The SATA harddrive, and the SATA optical drive; use this type of power cable,

Between it, and the SATA data cable, the SATA power cable's connector is longer. It has 15 contact pins.
A SATA data cable has 7-pins.

More in an added Comment.


Jan 09, 2013 | HP Pavilion a1630n Power Supply...

2 Answers

My 873 n will not turn on

if you are refering to a computer

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((MOTHERBOARD TO YOUR HARD DRIVE))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error even something as small as a faulty electrical extension or fan lead can cause this problem

follow the troubleshooting procedure a computer needs all of the data and electrical current to travel through every device and to have an end to be able work properly

a motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail check all electrical extensions make sure they are securely seated even the cd/dvd floppy drives need to have current go through make sure these drives are working also it could be a dirty computer clean all of the dust from your computer you could use a vacuum cleaner but whatever you use make absolutely sure there is no moisture gets to anything in your computer and before you touch anything be sure to wear an earth strap hope this helps

May 30, 2011 | HP System Power Supplies

1 Answer

Ref ASTEC power supply from old computer model SA 147-3505 I can pick up the logic 5 volts but not the +12 volts and -12 volts .FAN not energised so I guess there needs to be an elec link via the computer...

You can jumper on an ATX power supply by using a wire to connect pin 4 (green wire) to any of the grounds on the 20 pin ATX connector. The grounds are normally a black wire. You will need to put some sort of load on the power supply such as a hard drive to keep it running.

Feb 25, 2011 | Dell PWR,SUPPLY,145 WATTS,ASTEC SA150-3411...

1 Answer

I am trying to troubleshoot whether or not my ultra x2 connect 550 watt power supply is bad. When you press the power button on the computer, the light flashes and then noth9ing else happens. The light...

Well here is a way to check your power supply, on your hard drive connector using your volt meter and measuring from ground. this would be using one of two middle connectors it should measure +5 VDC on the red wire and + 12 VDC on the yellow wire. If these voltages are good then we got to see if the power supply is producing the -12VDC voltage. This voltage is ussed by the syustemboard on pin 14 of a 24 pin power supply. I would recommend not having your system board plugged in while measuring these votlages, but the power supply may need a load, I would plug in the cdrom.. Below are a couple of picture to explain this and a link to a website that has this documented.

dfish26_1.jpg The 24 pin main power connector was added in ATX12V 2.0 to provide extra power needed by PCI Express slots. The older 20 pin main power cable only has one 12 volt line. The new 24 pin connector added one line apiece for ground, 3.3, 5, and 12 volts. The extra pins made the auxiliary power cable unnecessary so most ATX12V 2.x power supplies don't have them. The 24 pin connector is polarized so it can only be plugged in pointing in the correct direction.
Pinout Pins 1 through 12 Pins 13 through 24 Description Wire color Pin number Pin number Wire color Description +3.3 volts orange 1 13 orange +3.3 volts +3.3 volts orange 2 14 blue -12 volts ground black 3 15 black ground +5 volts red 4 16 green PS_ON# ground black 5 17 black ground +5 volts red 6 18 black ground ground black 7 19 black ground PWR_OK gray 8 20 white -5 volts (optional) VSB +5 volts purple 9 21 red +5 volts +12 volts yellow 10 22 red +5 volts +12 volts yellow 11 23 red +5 volts +3.3 volts orange 12 24 black ground
Good Luck I hope this helps.

Nov 19, 2010 | PSA Ultra X2 Connect (ULT31851) 550-Watt...

1 Answer

Wat goes where from the power supply

on the newer psu's (power supply units) they are labeled. if they are not there is a basic rule. if it fits the socket without forcing it, use it there. there are many 4 pin plugs on a psu. these are all identical and all are exactly the same. they can be used anywhere a 4 pin connector is needed. newer psu's also have 6 pin, 8 pin and sata plugs. 6 pin and 8 pin are generally for video cards that are pcix sata pugs are for any sata drive, like a dvd or a hard disk. also there is a 24 pin or a 20 + 4 pin connector. this goes to the mother board.

Jun 26, 2010 | Packard Bell (190169) Power Supply

1 Answer

Power supply suddenly 'dead'

You check the power supply using multimeter. but before everything make sure the you are getting power from the power outlet.

Here is how you can check the power supply with multimeter

If the wall outlet and the power cord are good, make sure the connection at the motherboard is secure. Then you may have to face the fact that the power supply itself is bad. If you have a multimeter, you can test the power supply output before purchasing a new one. Simply follow these steps:
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply.

Mar 22, 2009 | System Power Supplies

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

Tower intermittently loses power

i think you have a problem in you power supply sir try changing it or try separating your monitors source of power.

Dec 10, 2008 | System Power Supplies

1 Answer

E machine wont start

Here's something you can try: If you can borrow a computer power supply rated at 350 Watts or more from someone, do the following: Unplug your power supply from the motherboard. If it's an older model (pre-Pentium 4), there will be one wide (20-pin) white plastic connector. Along one of the long sides of the connector, there's a retaining latch. Squeeze it, and gently rock the connector from side to side along its length, while pulling up. The connector should come free. If it's a newer PC, there will be a second connector with 4 pins, and yellow and black wires. If so, squeeze its latch and just pull up on it. Next, disconnect the white power connectors from the optical drives, hard drive, and floppy drive. If the internal fan you talk about is a case fan, unplug it, too. At this point, you should be able to take all of the power cables and hold them out of the case.

Now, plug the power cables from the power supply you borrowed into all of the sockets you just vacated. The motherboard connection(s) have a little nub on one side; this lines up with the latch on the plug(s). The hard drive and optical drive connectors only fit one way. The floppy connection is wider on one long edge; this sits on a little shelf when the connector is plugged in. Plug in the case fan. Make sure the borrowed unit is not resting inside the case. Finally, plug the AC power cord into the socket on the borrowed power supply. You should now be ready to push the PC's power button. Do so.

If the PC boots fine, you have a bad/failing power supply installed in it. Sometimes they just don't have enough power to boot the motherboard when other accessories are also drawing power. If more accessories than those which came with the PC were added, this makes the problem worse.

If this works, you need to replace the original power supply. With your PC turned off and unplugged, remove the 4 screws holding the power supply to the back of the case. Lift the unit out. If you can keep the borrowed one, it's simple. Place it into your casr where you removed the original one (note the unit will fit two ways, but the screw holes only line up with one of them), line up the screw holes, and install/tighten the screws. Plug in the AC cord, and boot the PC up. If everything is okay, turn it off.

Since you're already inside the case, take some canned are and dust off the internals. Be especially sure to remove any dust between the processor's heat sink fins. Hold the processor fan with a finger to keep it from spinning.

Of course, if you CAN'T keep the borrowed unit, disconnect it as above, obtain a replacement, and repeat the installation/connection steps above.

Let me know if this works.

Apr 08, 2008 | E-Machines Bestec ATX-300-12E Rev. D 300w...

5 Answers

HP Pavilion 752N shutting down issue

what kind of power supply is it? its it from hp or a 3 party? how many watts does it have just send me your computer specs to so i can check it out

Oct 10, 2007 | System Power Supplies

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