[CentOS] CentOS 5.7 gives me a blank screen after bootup

Wed Nov 2 18:29:54 UTC 2011
Scott Robbins <scottro at nyc.rr.com>

On Wed, Nov 02, 2011 at 08:14:17PM +0200, Rudi Ahlers wrote:
> Hi all,
> I have an odd problem, for which I couldn't find any suggestions on google.
> A CentOS 5.7x64 gives me a blank screen on bootup, both to the 17" LCD
> monitor connected to the VGA port, and to the KVMOVIP device
> built-into the server,

This sometimes seems to happen when it goes into framebuffer.  

Sometimes, it's an NVidia card trying to use nouveau, sometimes, the fb
module is missing, but it's never something I've investigated that

I see from your menu that you're running a xen kernel. I'm afraid I'm
not at all familiar with them.  However, you might try (no guarantee)
using nomodeset in the places where you have nofb.

I'll make the disclaimer that my solution may have nothing to do with
your problem, but I do know that what you're describing has happened to
me on older Fedora versions, and the problem was that when it went from
normal to framebuffer mode, something broke.

Leaving your grub for reference.

> First few lines of /etc/grub.conf:
> #          initrd /initrd-version.img
> #boot=/dev/md0
> default         0
> timeout=5
> splashimage=(hd0,0)/grub/splash.xpm.gz
> hiddenmenu
> title CentOS (2.6.18-274.7.1.el5xen)
>         root (hd0,0)
>         kernel /xen.gz-2.6.18-274.7.1.el5 dom0_mem=786M
>         module /vmlinuz-2.6.18-274.7.1.el5xen ro root=/dev/LVM01/root nofb
>         module /initrd-2.6.18-274.7.1.el5xen.img
> title CentOS (2.6.18-274.7.1.el5)
>         root (hd0,0)
>         kernel /vmlinuz-2.6.18-274.7.1.el5 ro root=/dev/LVM01/root nofb
>         initrd /initrd-2.6.18-274.7.1.el5.img

Scott Robbins
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