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Emachines 420 desktop. when I power it up, the on light just keeps flickering and nothing else happens.I have also switched it off(no light, ) then back on but still the same. Any ideas please

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  • Gary Chung
    Gary Chung May 11, 2010

    Hi Adie5, look like your pc is facing some hardware failure. Any error beep sound when you power up your desktop? Have you try change the RAM to test it?

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  • 981 Answers

Classic case of a failed power supply.  Replace the power supply and you can see whether anything was damaged when that failed.

Posted on Jul 22, 2008

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I cannot boot up the computer. When I push the front power button, nothing happens. When I flip the switch on the back, or unplug it for 30 secs and plug it back in, the fan starts up and a yellow light...


I had this happen to my emachines T1842 about a year ago. I replaced the power supply and it worked fine. It was about 25 bucks but fixed my problem. Make sure the red switch on the back hasnt been messed with. it should be on 115. If you have moved it, it may have blown a fuse inside the power supply.

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Try here.

http://www.emachines.com/support/options.html

The site does not support downloading of their manuals. I tried to find other information or manuals but cannot reach other sites on www.emachines.com at this time, I think they might be having site issues. I will keep looking and keep you posted. http://www.emachines.com/support/product_support.html not loading at this time from my location.

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Emachines have notoriously cheap power supplies. Often, while the power supply itself doesn't fail, it causes the failure of motherboard components, essentially trashing the computer.

Try the following:

First check and make absolutely certain that the power switch connector is properly connected to the motherboard. (Take standard grounding/safety precautions: wear a properly-grounded grounding strap, for example, when working with any internal components.)

Obtain a known-good power supply of equal or greater capacity to your eMachines PS and switch 'em out. 

If either of these fixes your problem, well and good. If not, the problem may be, as is all too common with eMachines power issues, a motherboard issue caused by the power supply.

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try to reseat the power cable of the computer and power it on again

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I would still try to replace the power supply first,before replacing the motherboard.In 80% cases that you are describing it is the power supply.
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Are the pins from the switch to the motherboard connected properly?

Could be a faulty switch on you case. T

ry shorting out the two power on pins (on motherboard) with a screw driver but be carefull not to touch anything else with it!! :)

hope this helps?

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I believe that the front button is not connecting to the switch for the power supply. Also make sure all internal connections are secure. Sometimes the button breaks from behind so that it cannot contact the switch. Let me know if it helps. There are other solutions if you tried this one first. 

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Could be a power supply problem but suspect its a problem with the motherboard. Unless you have a spare power supply or testing equipment I would suggest you take this to the local repair shop. For $30 they should be able to give you a good idea if the power supply is shot (cheap fix) or the motherboard (more expensive). Be aware that I also found lots of cases where a bad Emachine power supply also damaged the motherboard as well.

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