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motherboard H270M-ITX/ac problems

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  • motherboard H270M-ITX/ac problems

    <style type="text/css">p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; color: #454545}p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; color: #454545; min-height: 14.0px}</style>Hi everyone !
    I’ve got a brand new motherboard H270M-ITX/ac.
    But I can’t boot anymore.
    In a first time I try to boot on a usb key, sometime I can but I often can’t.
    Now I try to reinstall my os but I can’t boot on my usb key.
    So I try to flash my BIOS with ASRock default tool,
    next that it boot only on a screen : “select UEFI boot“ but my keyboard are not detected anymore so it select automatically my old os partition.
    Finaly my screen is not working anymore …


    Someone have an Idea ? I’m a little bit lost …
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