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Installed new motherboard, computer automaticly turns on, with out pressing power button and nothing comes on the screen

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  • Alex Keen Jul 17, 2008

    Hi There...



    Its a self build job...



    The motherboard model is: Asrock K8 Upgrade Vm800



    Being put into a Thermaltake Case



    And will be installing XP.



    I turn the power on from the rear and it starts auto, ive played around with the header leads, and nothing comes up on screen.



    i placed my old motherboard back into the computer and it works fine, i then swapped again and nothing happens



    Many thanks

  • Alex Keen Jul 17, 2008

    yea its new, nothing happens, got a AMD 64 septron chip

  • David Needham
    David Needham May 11, 2010

    Make/model motherboard?

    Make/model computer?

    Operating system?

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1. Check all connections again, especially the lead from the power button to the mobo. It seems a silly question, but is the four-pin ATX 12V connector firmly seated (it's gotta "click"). Yes, I know you've probably checked, but I had to ask. :-)

2. CPU fan connector--check/double check?

3. As fwadley so rightly noted, memory chip seating can be crucial as well (yes, another of my unpaid adverts for Crucial memory *heh*) Reseat. Use DeoxIt Gold or Stabilant 22 on essential electronic plugin components like memory, if you have ANY doubt as to connectivity/continuity issues. Try different memory modules.

IOW, it sounds very much like a missed/unfirm connection or grounding problem (yes, re-check positioning and connections of mobo to case).

Of course, recheck jumper settings (what CPU, exactly? Semprons come in various "flavors" and the jumpers can be set for either the 754 or 939 pinouts).

I recognize that you're not a beginner.These are just some of the things I'd recheck on an installation of my own gone south. 

:-)

Oh, "nothing comes up on screen"--means "no video"?This board has onboard video, doesn't it? The BIOS should, IIRC, "automagically" bypass that for setup, at least, if you were to try a PCI card for testing. Grab an old PCI graphics card and give that a shot if suggestions above fail.

Please report back with any error messages or other information.

Posted on Jul 17, 2008

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  • 482 Answers

Take out memory chips and try it. is it a new one from a store?

Posted on Jul 17, 2008

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