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Thread: GPU doesn't boot when using displayport

  1. 01-06-2011, 11:15 AM #1
    trifid
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    GPU doesn't boot when using displayport

    Hello all,

    I've been troubleshooting a problem on my pc since Tuesday. When I shutdown the pc the 2 digit lcd display on my motherboard lights up with the error 8.8. And when I turn the pc back on my 6950 fan spins at 100% and I get no display output. However the pc boots fine and I can use it through rdp. The error code displays regardless of power to the pc, I.e. it shows whether the power is connected to the psu or not.

    Through troubleshooting the problem I've identified that disconnecting the displayport cable or unplugging the power from the monitor instantly turns off the error and the pc can then boot. The monitors work fine through displayport when connected to the pc when it is on. The pc boots fine when the monitors are connected through dvi. I've also tried different combinations of monitors and cables and as soon as a monitor is connected through diaplayport it shows the error code.

    The problem didn't happen before Monday but the monitors were new on Friday. I'm now stuck for idea for what could be at fault.

    Specs:
    I7 920 at stock speeds
    Gigabyte ud5
    12gb ocz memory
    Corsair Hx620w
    HIS 6950
    7 HDD
    2X BENQ BL2400PT monitors connected through displayport.


    Thanks for your help.
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  2. 01-10-2011, 01:04 PM #2
    Particle
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    Change your DP cable. You might have one of those ones that has errantly connected the power pin between both sides of the cable. It causes all sorts of goofy problems, and I wouldn't be surprised if this is the reason why your error indicator is lit even when power is removed.

    NEC has posted a document about it. If you're handy with a multimeter, you can check your cable yourself: http://www.necdisplay.com/cms/docume...ort_Notice.pdf
    Particle's First Rule of Online Technical Discussion:
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    Rule 1A:
    Likewise, the frequency of a car pseudoanalogy to explain a technical concept increases with thread length. This will make many people chuckle, as computer people are rarely knowledgeable about vehicular mechanics.

    Rule 2:
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    Rule 2A:
    When a poster cannot properly refute a post they do not like (as described above), the poster will most likely invent fictitious counter-points and/or begin to attack the other's credibility in feeble ways that are dramatic but irrelevant. Do not underestimate this tactic, as in the online world this will sway many observers. Do not forget: Correctness is decided only by what is said last, the most loudly, or with greatest repetition.

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  3. 01-12-2011, 11:00 AM #3
    trifid
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    Quote Originally Posted by Particle View Post
    Change your DP cable. You might have one of those ones that has errantly connected the power pin between both sides of the cable. It causes all sorts of goofy problems, and I wouldn't be surprised if this is the reason why your error indicator is lit even when power is removed.

    NEC has posted a document about it. If you're handy with a multimeter, you can check your cable yourself: http://www.necdisplay.com/cms/docume...ort_Notice.pdf
    It happens on both cables so must be a design fault? I love you anyway! Thanks for the white paper on it.
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