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No power i have no power to my computer but i can't get power supply out

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  • Dick
    Dick May 11, 2010

    Why can't you get the power supply out?

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An AT power supply must have current draw to turn on. Remove every component not needed for boot ( Floppy, Hard, CD DVD Fan. Leave on Motherboard and CPU and Fan. With header connections connected ( HDD led, PWR on, PWR Led and speaker ) push the on switch and make sure the back of supply doesn't have a switch. Does anything happen? Write me back if you want and we'll try to get some juice out of the supply.

Posted on Jun 29, 2009

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3 Answers

Schematic atx diagram


I give up! Why would you need a schematic for a computer power supply? I've been in the computer business for over 30 years and have never needed a power supply schematic. Just curious!

Sep 18, 2013 | Antec BP350 350-Watt Power Supply

Tip

How to replace a computer's power supply


The power supply is one of the most common components to fail inside a desktop computer. If you don't mind turning a screwdriver, you can replace a bad power supply yourself and save on repair costs.

Before purchasing a replacement power supply:

- Make sure to get a power supply that is rated for at least the same wattage as your current power supply.
- Verify that the new power supply has all of the necessary connectors that your current one has. You can either check this visually by looking at the connectors that you have, or by making sure your computer is listed as one of the models that the new power supply is compatible with.
- Make sure the new power supply will fit inside your computer's case. (If the new power supply is compatible with your computer, that won't be a concern.)

To install the new power supply:

- Turn your computer off and unplug it from its power source.
- Unplug all of the cables leading from your computer, including the power cable.
- Open the computer's case. (If you're not sure how to do this, you can probably look it up online. Most computers either have screws in the back that come out, a side panel that slides off, or they open up like a clamshell.)
- Disconnect all of the cables leading from your power supply. Note what component each connector plugs into. You should have connectors for your fan(s), hard drive(s), optical and/or floppy drive(s), motherboard (may be one or two connectors), and the front power switch.
- Unscrew the power supply from the system case and remove it.
- Set the new power supply in the case facing the same way as the old power supply and screw it in.
- Attach all of the connectors. (You may have more connectors than components, but make sure each component that was connected before is connected again now.)
- Close the system case and reattach any screws.
- Plug the power cable into the power supply and then into the wall outlet.
- Reattach all other cables.
- Make sure the power switch on the back of the power supply is on.
- Make sure the voltage switch on the back of the power supply is set to the correct voltage (115 volts in the United States).
- Turn on the computer and verify that it boots up correctly.

on Jan 29, 2011 | Computers & Internet

1 Answer

Is it possible to cause a powersupply overlaod


Power surge or lightning strike.

Power Supply Problems
Computer power supplies are often taken for granted even though the job they do is complex. While every power supply takes the electrical current from an AC outlet and converts it into something that an appliance can use, a computer power supply must do so at several different voltages at once.
A faulty power supply can cause many random computer issues and learning to diagnose them can save you a great deal of time.Recognizing an Overloaded Power Supply
Most power supplies have variable-speed fans.
If the fan always emits a loud, whining noise, there might be a problem.
This can be one of your first clues that you might be stressing your power supply.
First, check the power supply itself.
Some power supplies have two cooling fans and one may need to be connected to the computer's motherboard.
If there is only one cooling fan, examine it. Is it dirty?
The fan can be cleaned with a cotton swab dampened with a little rubbing alcohol.
If the power supply is clean and the auxiliary cooling fan (if applicable) is connected, you may be working the power supply too hard.
If you have a powerful computer with several hard drives, multiple video cards, and a speedy processor, temporarily disconnect a few of these components to see if this cures the problem. If it does, you will need to consider purchasing a new power supply.
An overloaded power supply may cause your computer to lock up or reboot when the computer is working particularly hard, such as when you are playing a game, rendering a complicated graphic image, or recording a song with real-time digital signal processing.
If you are experiencing these symptoms, consider replacing the power supply.

Recognizing a Failing Power Supply
A failing power supply can be difficult to diagnose. An audible signal may be your first clue, though. If you hear a grinding, buzzing, hissing, or clicking sound from your power supply, replace it immediately. It may be a serious fire risk.
Not every power supply fails in such spectacular fashion, however.
If your computer shuts down during the boot process or randomly while you are using the PC or if it locks up or reboots when you are not performing a complicated task, the power supply may be to blame.
Safety Note
Computer power supplies contain capacitors that hold a potentially dangerous charge.
If you are not completely comfortable around electronics, do not attempt to clean a dirty power supply on your own.
Have an expert do it for you, or discard the power supply and purchase a new one.
http://www.fonerbooks.com/power.htm
http://www.tomshardware.com/reviews/stress-test,1073.html
http://pcguide.com/ref/power/sup/index.htm


Sep 15, 2013 | E-Machines W6409 (7234) PC Desktop

1 Answer

How to troubleshoot Bestec ATX-1956D Power supply to determine if it is the power supply or another computer component..computer will not power up green light on power supply goes dim but does not flash...


The power supply is very inexpensive and can most likely be bought from any of your computer retailers, Amazon - Just make sure to confirm the right model type of power supply. BEST to have it tested before replacing it. To make sure that is the issue.. Many computer shops will test for free.

Oct 06, 2011 | HP Bestec ATX-1956D 200w HP Part No...

1 Answer

How do you test a Bestec power supply


Hi,
I assume that your power supply was working before and am not sure if it is the power supply that is faulty on your computer or not. Testing a power supply that is connected to a computer is quite easy. All you have to do is try to turn your computer on. See if there is a small light available on your motherboard. This small LED is called the flea light. If there is try to eject the optical drive (CD or DVD drive) on your computer. If the tray ejects, then your power supply is good. If it didn't then it does not supply enough power. If there are no light at all in your computer, then you definitely have a fully busted power supply.
Please do update me on what happened here.

Sep 11, 2011 | Bestec (ATX-250-12E) 250-Watt Power Supply

1 Answer

I purchased a 250W Bestec Power Supply. When I plugged it in to the motherboard the light on the power supply just blinks and the computer does not turn on. I have another power supply that is the same...


did you check the switch on the back of the power supply? and is it under rated for your computer? 250 watts is much lower than what most computers use now days. the avg is 450 watt.

Jan 29, 2011 | Bestec (ATX-250-12E) 250-Watt Power Supply

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

2 Answers

Not booting up showing green light wont show on screen


Try to reinsert the RAM! Remove it, clean it and insert it back!!!

hope it will work!!

Dec 19, 2009 | HP Compaq Presario SR1610NX (ED865AA) PC...

1 Answer

Dead Computer


Is the fan of the power supply still circulating?

If not, your power supply needs replacement.

Jul 24, 2009 | Okia 420w UL Approved ATX Computer Power...

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