yes, today it was the issue for me too. SL61 after upgrade "yum upgrade; 
reboot"
did not appeared on the screen of my VM.

I did

1. Ctrl/Alt/F1 and get the text screen

2. yum --releasever=6.2 update

3. reboot the VM

and vu a la the system started as expected (with X-server).

Best regards,

Andrey





On Thu, 12 Jul 2012, Jean-Christophe LAMBRY wrote:

> Date: Thu, 12 Jul 2012 09:32:14 +0200
> From: Jean-Christophe LAMBRY <[log in to unmask]>
> To: Boris Goldowsky <[log in to unmask]>
> Cc: [log in to unmask]
> Subject: Re: X11 server won't start after yum upgrade
> 
> Le mercredi 11 juillet 2012 a 16:51 +0000, Boris Goldowsky a ecrit :
> 
> I also experienced this problem today.  I was able to start up the system again after executi
> ng
> sudo yum downgrade xorg-X11-server-common xorg-X11-server-Xorg
> 
> Hopefully the matching driver packages for the new Xorg version will show up in the yum repos
> itories soon.
> 
> Boris
> 
> Thanks a lot. The yum downgrade command resolved the problem.
> 
>             Jean-Christophe
> 
> 
>

-- 
____________________________________________________________________
NAME: Andrey Y. Shevel (Chevel) :  EMAIL: [log in to unmask]  \
Computing Systems Department    :     http://hepd.pnpi.spb.ru/CSD     |
TEL : +7(81371)36040 | POST ADDRESS: Petersburg Nuclear Physics Inst. |
FAX : +7(81371)36040 | 188300, Gatchina, Leningrad district, Russia.  |
______+7(81371)46256________________________________________________ /