Question about E-Machines T1742 PC Desktop

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Power Problem The power supply burnt out in my PC, I ordered a new one and installed it, the fan on the processor and the power supply comes on, but the computer won't come on it only has a flashing green light on the power button and the small led under the power button flashes yellow, very fast flashes, no beeps of any kind,

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Re: Power Problem

Do the following to solve your problem
1. Checkt the power cables are connected into the ports
2. See that if there is a 4pin connector into the mother board.
3. See that the power connector and the hdd cable is connected to the HDD.

Start the system.

if the problem is not solved do the following

Un- Plug all the connectors and re-connect them carefully one by one.

Let me know if your problem is solved and rate me as FIXYA!

Posted on Apr 24, 2008

Re: Power Problem

If the above didn't work try make sure u connected every thing right. For example Common mistake is that u need too connect main power plug to ur hardrive first then cd drive. They should have numbers on them 1 is main and 2 3 4 5 and so on. And make sure u connect the hardrive to the mother board correctly. It could have just u connect ur hardrive to the wrong slot.

Posted on Oct 06, 2007

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Re: Power Problem

Try powering it on with the hard drive unplugged. If any cd, dvd or floppy drive is in, plug them out also. Retry to see if you get at least a boot screen.

Posted on Mar 17, 2007

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Re: Power Problem

Check if you plugged in your monitor cables just right, check it, plug it in, I dont know any other cause of this.

Posted on Mar 17, 2007

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I have done all that you saud to do. Now the problem I have is the computer will not turn on at all. It's like the power has been turned off from inside the operating progam. I have windows 7, is this...


Phase 1
After power button pressed, computer will detect 5 components :
1. Power supply - OK (enough power)
2. Main-board - OK
3. Processor - OK
4. Memory - OK
5. Video Card / VGA - OK
== beep sound .. (1 time) or on the monitor, display appears BIOS ==

The characteristics of damage to power supply
1. Power supply fan does not spin

Video power supply fan not spinning

If the power supply fan is not spinning, the possible cause of damage to power supply. Solution, replace the power supply.

How to check the damage to power supply
2. Power supply is weak (resulting voltage power supply can not turn on the computer or the voltage is less)
The characteristics of damage to the processor

Normal fan without processor

Normal fan with processor

Based on experience, the possibility of damage processors is very small. To check for damage to the processor, install the processor to another computer (for comparison).

The characteristics of main-board damage
Because the new main-board, so the possibility of the main-board damage, very small. The characteristics of damage to the main-board, when the power button is pressed
1. Power supply fan not spinning
2. Processor fan is not spinning
3. Casing lamp is not lit
4. Main-board lamp does not light

The characteristics of the memory damage or dirty memory
1. The characteristics of normal memory, but installation is not correct or dirty

When the computer is turned on, the sound



Picture a
Release Memory

Picture b
Clean the memory slots with a brush

Picture c
Clean the gold layer memory with a pencil eraser

Picture d
Reinstall the memory correctly

The characteristics of damage to video cards

Solution, remove the video card, clean the gold layer with a pencil eraser.

I hope this information helps.

Oct 23, 2011 | PC Desktops

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

Blue screen came on then the computer went off and will not boot up. will re installing windows xp work or what do i do?

Due to your diagnosis, it sounds to me like Power Supply failure.

Weak Voltage power rail.
Not enough power to keep the Processor on.

(In this case, No, re-installing Windows in a Repair, will not fix the problem)

Lights will light, and fans may spin, but there isn't enough power for the Processor.

1) ALL the lights 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. Depends on what Processor it is.

(For example, if this Optiplex GX260 was ordered with a Pentium 4, 2.26GHz Processor, {Socket 478}, it can use up to 58 Watts,

If this computer, and Power Supply are dirty inside, it's a pretty sure bet the Power Supply is bad.

Test the Voltages of the Power Supply to see if they are correct. Specifically the 12 Volt power rail.
If it is 11 to 13 Volts, it's okay.
Less than 11 Volts requires replacing the Power Supply.

Test can be done with an inexpensive multimeter, or a power supply tester.
One example of a power supply tester,

Jun 10, 2010 | Dell OptiPlex GX260 PC Desktop

1 Answer

I have an Acer Aspire x1200, when I press the power button, only the fan goes on, power button does not even light up..' Thanks

their r a few possible solutions the first thing i would chk is which fan is on , processor or power supply, or both. if no processor fan, processor/motherboard may b burnt or . chk for loose connections.. if your screen image is black u may have fried the board, if blue then it would b a hardware issue..

Apr 29, 2010 | Acer Aspire X1200-B1601A PC Desktop

1 Answer

My pc is an emachine but when i try to turn it on it automatically turns off but the fan is running

The power supply is bad. Electrolytic Capacitors inside the power supply. The 'Caps' are filters for the power supply. (Used in both the Input Stage, and Output Stage)

Inside the power supply are Voltage Rails. The 3.3 volt rail, the 5 volt rail, and the 12 volt rail.
Bad capacitors = a bad voltage rail. Not enough power from the power supply. Your processor doesn't have enough power to turn on, or stay on.

Why is the fan running?
ALL the lights use less than 1 Watt of power.
EACH fan uses 2 to 3 Watts.
A processor can use 55 to 125 Watts. Depends on what processor it is.
Plenty of power to spin a simple fan, but not enough power for the processor.

Yes I'm sure, is the answer to your question.
(No I'm not psychic. Approximately 80 percent of the computers that come into my shop, have bad power supply's)

Jul 29, 2009 | E-Machines eMachines Desktop PC

1 Answer

Pc sht down stating thermal error. suppose processr fan not working. can this be the cause of the eror?

Most of the time you'll never hear the CPU fan. If you don't hear the normal fan sounds coming from your computer, it is most likely the power supply cooling fan. Hold you hand at the back of the computer where the power chord plugs in, while the computer is running, and test if you feel air blowing on your hand. If you don't, then replace your power supply. Make sure, when checking for a new PS that you get the correct pin count. Best to order from Dell since proprietary systems usually use proprietary parts and a generic PS won't fit in the opening at the back of the computer (alignment of the plug and the fan with the opening, etc.)

May 25, 2009 | Dell Dimension 4600 PC Desktop

1 Answer

My processor has two fans the upper one doesn't work at all.

Is the upper fan in your power supply?

Your computer actually has 3 fans, one attached to the back of the case, one on the processor, and one in the power supply.

At any rate, fans are cheap. Go to,,,, get the idea.

Measure your fan, preferably in mm or cm, and order several of the proper sizes and replace all three.

Apr 17, 2009 | HP Pavilion 520c PC Desktop

2 Answers

Updrading power supply of Dell Optiplex GX280 Small Desktop.

Hi there.
No, 400Watts will not affect your computers performance, it just means that you will be able to add more peripheral devices to your PC, for example, an external or internal hard drive or more USB devices.
Make sure you get the power supply from Dell themselves as you will find it difficult to install a standard PSU (power supply unit).

Good luck and thanks for using Fixya!!!

Mar 01, 2009 | Dell OptiPlex GX280 PC Desktop

2 Answers

Power shuts off and takes several minutes to turn back on

If the computer is overheating, those are the symptoms that would happen. Turn on your computer with the cover off. Are all the fans working (even in the power supply)? Is there a lot of dust build-up anywhere? Can you try another power supply? You need not install it in the computer case, just hook up the connectors with the known good power supply just outside the case and try it. Is your processor heat sink securely connected to the processor?

Dec 29, 2008 | Dell Precision 670 (670MIN) PC Desktop

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