Question about E-Machines T2742 PC Desktop

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My E machine

I have an E machine and the power supply I think is out on it?.?
When I plug it into the wall ,the green light on the mother board comes on,but when I hit the button to turn the tower on it doesnt turn on ...

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Re: My E machine

How does the power button feel when you push it, can you feel a little resistance or here or feel a little click? if not the button assembly may be broken. The E Machine has a button assembly that is one piece of plastic with two sharp angles on it to reach the actual button that turns on the machine. I have fixed a couple of these with 5 minute epoxy and some hard plastic I had laying around.

Posted on Nov 09, 2007

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Please help me. Am having HP desktop computer. When I plug in the power cable the green light on the board switch meaning the board and the power pack are working but when I press the switch key the...

Open the side of the case and look look for a led on the mainboard. It should be on if the power supply is working properly. Have any changes been made inside the computer such as a new video card or harddrive? Perhaps the connector for the power switch has either come of the mother board or has failed.

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We had a power outage and now my HP m1264n desktop computer will not start. The green light on the back is flashing, but nothing happens when I press the power button on the front. Could it be my power...

the green light on the power supply but it dosnt relay to the mother board,the first item I would nbe concerned with is that the power supply that is,unplug your computer open up the access panel on the tower,the largest plug from the power supply,going to the motherboard unplug it . the plug has a release on it pinch inward and pull up at the sametime this will relaese it, now plug in your computer to the wall power and if your power supply has a switch on it turn it on,also make sure the 240 110 volt switch it's a slide switch on the power supply is on 110 volts if your not in europeits 110 here in the usa, if the light fails to blink or even turn on its the fuse in the power supply,if the light comes on blinking the power supply needs more attention if the light stays on full the problem lyes beyond the power supplyI would guess the fuse is the problem,now youll find two of them within the case of the power supply hope this helps.

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Compaq Deskpro EN 1GHz. power supply is ok. But not start with power on button. Green LED on mother board is on. How can I start this with start button (I think motherboard board problem.

Unplug it from the wall. Remove the side panel. Look for a small circular battery (similar to watch battery). Remove the battery for 30 seconds. Replace the battery, plug it back in. This should reset the bios. Green light on the board does not necessarily say good power supply as well. Very likely motherboard or power supply.

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I would suggest trying to replace the power supply. If that does not fix the issue, i would need to hear more about the computer.

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Emachine t3958

First check to see if a drive died. Unplug all the drive Floppy, hard and dvd or burns. I have come across many time that a drive will die and keep motherboard from booting. Being that you say you get a green light on the motherboard shows that the power suppy is providing some power. But for some reason the internal self test is faulting the power suppy. I have not come cross any bad power supplies killing a motherboard. But I have come across power supplies killing drives. The power switch is a normal open switch so the only time you be able test continuity on it is if you hold the switch in, or the closed position.

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Emachine T2958 will not turn on - has no power

Dear asksforhelp,

As u have told that u have change the power cord then the second thing u can try that check the SMPS is it working or not to check this u have to know that where is the SMPS where u pluged in the power cord in the cpu that thing is SMPS check wether the SMPS fan moving or not if no then u have to replace the SMPS if it is working then u have check wether the mother Board get the power supply or not check the 12 pin power connector insert it in mother Board if still it not working then it is definatly problem with u r Mother Board. So it is better for u that to go for New One.

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Power Green Light Flashing HP Desk Top PC m7250n

During a power outage their is a surge when power come back on the grid (surge can be caused by lighting strikes akso). This surge trips the internal procters inside the power supply to protect the Mother Board, hard drive, processor and fans and any device that pulls wattage from the power supply. Since all these power using devices are trying to pull power at the same time to boot the computer back up one ends up with a loop of surge thrugh the power supply with a protective trip, reset, surge again and trip again. This will continue in this loop as the computer is trying to boot all the devices at one time (Mobo, Hd, processor, cooling fans and other devices). Simoly, more power wattage is being demanded than the protectors will allow at one time causing a protective shutdown followed by a restart followe by a protective shutdown in a continious loop.
The normall sequence for a boot is to boot the board, processor and fans followed by a boot of the hard drive, and other boot devices once the board is energised, NOT all devices at the same time, as this results in an overload and trips the protectors. This protective loop is indicated by the blinking light as the power is turned on and then shut down for protection as the wattage pull is over the demand that the protectors will allow.
Blinking light indictes you are in the protective loop.
SOLUTION: 1. Disconnect the Mother Board connector, with the computer unplugged, this will allow the power supply to reset at maximum wattage upon reboot.
2. Disconnect the Hard Drive power connector and ay boot device power supply cables, this will allow the Mother Board, processors and fans to boot without an overload of the protector inside the power supply.
3. Plug in the computer and the indicator light will be solid green indicating that it is reset and out of the loop.
4. With the computer pluged in and the Power Supply fully energised, plug in the Mother Board. The computer will now boot, and the processor fan will come on and the cooling fans.
5. After computer has rebooted, shut the computer back down and connect the Hard Drive power cable and any other power cablis that were unplugged.
6. Reboot with all cables connected and you are up and running again.


Hope this helps everone with power outages and lightining strikes. It is a rather common problem and can also occure when building a computer and one missmatches the power supply with the board wattage needs. If the board wattage needs are greater than the power supply output you will get stuck in a potective loop eventually. WHEN BUILDING A COMPUTER ALWAYS MAKE SURE THE POWER SUPPLY CAN PRODUCE MORE WATTAGE THAN YOU CAN CONSUME AT THE MAXAMUM LOAD.
Have a great computing experiense.

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1 Answer

Light on power supply blinks once than nothing, the computer (hp) will not turn on.  It has no responses, when I unplug the power supply from the computer and plug it into the wall it does the same thing...

the power box is no good. get the numbers off it and look on ebay for a replacement or you can go to
you can find them cheep. most of the time when the box blows and the mother board go's too, I would get a motherbaord as well.

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