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Power supply Model#TFX0250D5w

Computer will not turn on, how do I troubleshoot the power supply

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  • Dell Master
  • 998 Answers

You don't, buy a new one.

Posted on Jan 02, 2015


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Posted on Jan 02, 2017

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SOURCE: dell 8200 won't turn on - power supply is good

Have you put in a CMOS Battery? Hard drive works?Any more information that was not in your first post?


Posted on Sep 06, 2008

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SOURCE: HP computer doesn't turn on

Your power supply is bad--you will need to replace. I suggest looking at tigerdiect for a replacement.

Posted on Dec 12, 2008

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Dell Power Supply Model #TFX0250D5W

First, check that your power cable is not faulty; believe it or not, it is a common problem.
Second, check that your power switch has not shorted out; that is another common problem.
Third, the only way to check your PS is to swap it out with another. If you don't have one, you can also order a power supply tester (which is what I have). Try and type "power supply tester" in their search box. Also check the user reviews for dependability.

Apr 22, 2014 | Dell Computers & Internet

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I want to download dell rev a00 motherboard driver

go to dell web site then to support then type in board some do have autodect ok

Mar 19, 2014 | Bestec Dell TFX0250D5W Rev X4,Rev.:A00...

1 Answer

Wiring bestec atx 1523d to bestec tfx0250d5w revx4

Are you replacing one with the other or trying to wire them together? If the latter, why are you doing so? If you need more power, you'll want to buy a bigger power supply. I suppose you could wire it to use two, but you'd have to find a way to trigger the second power supply to come one or do it manually. I wouldn't try it unless it was an absolute last resort with no other options, though.

Jan 01, 2014 | Dell Computers & Internet

2 Answers

No Pwer

The Power Supply is bad dwadley.

Weak voltage power rail.

1) IF all of the LED lights were on at once, they would use less than 1 Watt of power.

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

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

The Dell Inspiron 530s series of desktop computers, come with an Intel processor.
Options are either a model of Core2 Duo, Pentium Dual-Core, or Celeron.

Click on Specifications.

Replacing the Power Supply,

In the middle column at the bottom, click on Power Supply.

The computer is an SFF design. Small Form Factor.

Because of the space saving design, the Power Supply is an SFF design also.
Makes it special.

Just one example, not a recommendation. You search for the best price and quality,

Click on the Power Supply image.
(Whew! That get's great big! NOT!)

An average ATX power supply's dimensions (Used in most mid-size, and full size desktop computers), is approximately;
6 Inches Wide, 5-1/2 Inches Long, and 3-1/2 Inches Tall.

The SFF power supply dimensions in your desktop computer, is around
4-1/2 Inches Wide, 3-1/2 Inches Tall, and 5-1/2 Inches Long.

The dimensions are what makes it special.

Another view of the Power Supply,

1) Computer on a table, computer unplugged from power, (AT the surge protector side. NEVER unplug at the Power Supply side), computer case open.

2) Follow Anti-Static Precautions.

Anti-Static Precautions:
Your body carries Static electricity. Static WILL fry out (Short Circuit) the hardware components inside a computer.

Relieve your body of Static BEFORE working on the computer.

Again, computer on a table.
A bed, couch, or directly on a carpeted floor, are HIGH areas of Static.

If your table is on a carpeted floor, refrain from swinging your feet across the carpet.

Computer unplugged from power, computer case open, TOUCH the metal frame of the open computer case, (Unpainted surface), to 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.

3) Opening the computer case;

4) You will have to disconnect all power cables, leading from the Power Supply. (Upper rear of computer case)
Make notes, and drawings as to where each cable plugs into.

If you have problems when reconnecting the power cables, Relax.
Just post in a Comment, and I will guide you step by step.

The plastic Front of your computer is the Front Panel.

The area of contact pins on the motherboard, that the cables (Wires) from the Front Panel go to; is the Front Panel header.

DEFINITELY make notes, and drawings, as to what Front Panel cables, plug to what contact pins, BEFORE touching anything inside the computer.

If you accidentally knock a cable off a contact pin, (Or more than one),
I Do NOT have the pinout to give you.

(The Front Panel cables may all go to one connector, that fits over the Front Panel header contact pins. I do not know.
Haven't worked on one yet, and have not owned one.

Each Front Panel header, and Front Panel cable connections, are specific to that computer.

The rest of the technology used inside the computer, is just standard desktop computer technology. )

For additional questions please post in a Comment.
(And/Or to have me explain further on anything I have stated )


Mar 19, 2012 | Dell Inspiron 530s Desktop Computer

1 Answer

I have a HP M8417c with a 365-Watt Power supply.

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..

Feb 18, 2012 | HP 365-Watt Power Supply

1 Answer

Bestec power supply LED flashing; computer will not turn on.

Most computer testing facilities will test your current power supply for free. A replacement is very inexpensive to replace. Bestbuy, MicroCenter, small computer shops and buy replacemnent from, Just make sure you have the correct information for your replacement. The model number on the power supply would be your best bet in most cases. Good luck and have a great day. I buy power supplies as low as $15 dollars Generic

Feb 20, 2011 | HP Computers & Internet

1 Answer

TFX0250D5W Rev x4 Cooling fan getting noisy. (Dell Inspiron 530s)

Check it for dust / dirt. Clean it or replace it.
Good luck,
Jeff Mc.

Jan 15, 2011 | Bestec (ATX100-5) (ATX1005B) 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,

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

Computer does not turn on

you can try your power supply if it works by jumpering its pin. try to insert copper wire in pin 11 and connect it to pin 12. and turn o your power supply. But if it won't works then used tester and test its circuit boards particularly  is capacitors, resistors and even the transformer inside the power supply. Or if you can't make it then you can call a technician either in computer or electrical to test your power supply if it still working or not. In that wy can be sure in making decision if its really your power supply got problem or not.


Jun 26, 2009 | Lite On (PA41519B1) 150-Watt Power Supply

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