Black Screen After Install / CentOS 7.2

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Hi, i just installed CentOS 7.2 on my little “server” but i get a black screen during boot. It is a Asrock Am1h-itx mainboard with an AMD 5350
CPU (onboard graphic). I created a raid 6 but i dont think thats the problem, as the boot process goes pretty far. I would even say its going until X should start, but it is a server install, so i guess there is no X. Can someone tell me what could i do to get more information? Is there some kind of nomodeset param available for the grub cmd line param which i could try?

Thanks

5 thoughts on - Black Screen After Install / CentOS 7.2

  • screen during boot. It is a Asrock Am1h-itx mainboard with an AMD 5350 CPU
    (onboard graphic). process goes pretty far. I would even say its going until X should start, but it is a server install, so i guess there is no X. some kind of nomodeset param available for the grub cmd line param which i could try?

    Yes you can use nomodeset, are you able to boot with the diagnostic kernel which has minimum display requirement?

  • Earl A Ramirez wrote:

    I’d also suggest several things:

    1. If it’s a server, why do you need X?
    2. If you do, then I’d start out by having it come up in runlevel 3, *not* 5,
    and then as root I’d run startx, and see what error messages there are.
    Doing this gives you a much more controlled environment in which to
    debug the X issues.
    3. One final thought: what do you get when you do yum grouplist – what
    X or Desktop groups are installed?

    mark

  • X is not installed. I removed rhgb and quiet and replaced that with nomodeset, now i can boot. I am just wondering why the rescue/diagnostic mode did not help me in this case and turned black too. And i wonder what i have to do to boot without nomodeset.

    Am 16.05.2016 um 16:45 schrieb m.roth@5-cent.us:

  • Using nomodeset worked. Diagnostic kernel did not work. Any idea what i have to do to boot without using nomodeset?

    Am 16.05.2016 um 15:36 schrieb Earl A Ramirez:

  • Does the system not boot, or do you simply not get a VGA console? If it’s the latter, you should be able to log in and check the system via SSH.

    I’d guess that the system is selecting a mode that the monitor attached doesn’t support. If that’s the case, then your options are to use
    “nomodeset” or to specify a generic VGA mode that you prefer.