I'd look in the logs for Xorg failures.
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On Tue, 4 Mar 2014, Pasi Kärkkäinen wrote:
> Date: Tue, 4 Mar 2014 21:45:01 +0200
> From: Pasi Kärkkäinen <pasik at iki.fi>
> Reply-To: Discussion about the virtualization on CentOS
> <centos-virt at centos.org>
> To: Discussion about the virtualization on CentOS <centos-virt at centos.org>
> Subject: Re: [CentOS-virt] Xen4CentOS installation strangeness
>
> On Tue, Mar 04, 2014 at 02:50:40PM +0200, Peter Peltonen wrote:
>> Hi,
>> I have a server with Supermicro X7DVL-3 (P9) motherboard, 16G ECC RAM and
>> LSI SAS 1068e RAID controller. I installed CentOS 6.5 64bit on the machine
>> without any problems, but after following the Xen setup steps at
>> [1]http://wiki.centos.org/HowTos/Xen/Xen4QuickStart
>> which installed me the kernel 3.10.32-11.el6.centos.alt.x86_64, I
>> encountered a problem: After "Starting certmonger [OK]" the screen went
>> black and the system became unresponsive: keyboard was not working
>> (NumLock did not respond) and SSH was not responding either. After first
>> lockup I increased dom0 max mem to 2G, but rebooting after that produced
>> the same result. The strange thing is, that after a third reboot
>> everything worked ok: screen went black for a moment after "Staring
>> certmonger [OK]" but after that the graphical login screen appeared and I
>> could use the system normally. The fourth reboot went ok as well.
>> Any ideas what could cause this kind of behaviour?
>>
>
> No idea really.. but what you should do is to enable/configure a serial console,
> probably by using the IPMI SOL, so you can capture and log all the Xen and dom0 kernel
> boot messages..
>
> So we can hopefully *see* what the issue is, and not have to guess :)
>
> -- Pasi
>
>> Regards,
>> Peter
>>
>
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