Question about E-Machines T6420 PC Desktop

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Emachine - T6420 - Monitor on stand by, no picture, fan running non stop, hard drive power on, screen blank, monitor in yellow not green the programs would end after 10 seconds---if you opened programs/application one coud see them for 10 seconds then all applications would shut down--2 days later--- now--i am left with just a blank screen, fan and hard drive powering up, main fan that usually turns after after 10 seconds- stay on permanete, monitor= yellow buttin, blank. Is this the video card and if so how do I purchase a new one or used one?

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  • chris stark
    chris stark Jan 02, 2009

    How do I test the monther board? - I have no clue...only noise we hear is fan, cd drive and hard divel they turn on. cd drive loads-blinking lights, emachine blue light is on and is blue on the big E

    but below it --thr big E---the thinking light the little light that blinks yellow when the computer thinks - is not turning on at all- no light.

  • chris stark
    chris stark Jan 02, 2009


    TRIED PLUGGING IN HEAD PHONES NO LIGHT, TRIED THUMP DRIVE NO LIGHT, -cell phone did not recognize being plugged in via a usb cord.

  • Anonymous Jan 02, 2009

    I have a Gateway GX7018E Desktop Computer
    Does this have a video card in it could swap out to use in the Emachine - T6420

  • chris stark
    chris stark Jan 02, 2009

    I have a Gateway GX7018E Desktop Computer does this have a video card that I can swap out and test use in my eMachine T6420?



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All the E-machine computers I've worked on had the video as part of the motherboard. You might try borrowing a pci video card from someone and intalling it just to test. My solution is to buy a new computer if it won't work anymore, Walmart sells them for $300 to $400 with a monitor now days.

Posted on Jan 02, 2009

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Most likely your video card is broken. To check if the motherboard isnt broken either, I would suggest you test usb, sound, and other features of the motherboard.
 If your motherboard isnt broken then you have to buy a "pci-e graphics card" at your local store. Shouldnt cost much, about $40-70. Hope that helps.

Posted on Jan 02, 2009

  • mircenaj Jan 02, 2009

    Test a usb port, turn on the computer, and get something that uses the usb port. If you can tell that its working, then its not broken.

    Or connect your speakers to the computer, see if they make any sound when the computer is on.

    Reply back when you test it.

  • mircenaj Jan 02, 2009

    Im not sure if im right, but judging by what you said, i think your motherboard might be broken, and if it is, it means you either need to buy a new motherboard (same model ~$100) or a new computer.

    You can always buy a cheapo PCI-E graphics card to be 100% sure that the motherboard is broken. If you do decide to buy the graphics card, turn on the computer, let it on for 5 minutes, then restart the computer, let it on again, and see if windows pops up.

    Sorry for the bad news.



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This is the same problem on the T6420 I am not sure how to add.

Your problem is the motherboard, it has blown. See my emachine support pages at: and click on the text that says "emachine support" You can contact me by email on the website or by email. Chris

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Gateway GX7018E / T6420 = swap video cards for a test?????

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Jan 02, 2009 | E-Machines T6420 PC Desktop

2 Answers

Monitor on Standby / NO picture / all fans ON highest level

dear sir

here as u say the problem is actuly not a video card problem some time power plug or power connector problem make yr pc problem first u need to chek power connecter or power cable is ok or not then try to clean RAM if dust jam on ram that time it's not display and last on list is chek yr cpu fan is conneted propper or not yr pc has a AMD proceaser so it need to cool it's help u..:)

if u try to perchase new video card then u need PCI express card..

please Vote

Jan 01, 2009 | E-Machines T6420 PC Desktop

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I have a emachine T6420

ohk i also have an emachine make sure you have the moniter hooked up all the way i have had the same problem

Dec 31, 2008 | E-Machines T6420 PC Desktop

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Hi, i am workiing on an emachine T6420 for my brother and this thing starts up with the fans running and a black screen. my monitor that i connected to his computer shows a yellow standby light on the...

That's exactly what it sounds like. I would put in a new video card (or used one, if you have one) into one of the expansion slots and run it from there.

I would suggest to go into VGA mode just to make sure, but since your monitor never even gets off standby, I'd be 99% it's the onboard video.

Hope this helps!

Dec 28, 2008 | E-Machines T6420 PC Desktop

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