Today a SL6.1 with kernel (Linux mu2 2.6.32-220.13.1.el6.x86_64 #1 SMP Tue Apr 17 15:16:22 CDT 2012 x86_64 x86_64 x86_64 GNU/Linux) on an optiplex 980 has a blank screen.

I rebooted to 2.6.32-220.13.1 (it was using 17.1) and you see the asus (monitor) and dell logos. You see the kernel selection briefly then nothing. I can remote login to the PC. 

I don't see anything of note in the dmesg or /var/log/ Xorg log files except the usual 
messages:Jun 18 08:54:07 mu2 NetworkManager[1319]: <error> [1340027647.919205] [nm-manager.c:1360] user_proxy_init(): could not init user settings proxy: (3) Could not get owner of name 'org.freedesktop.NetworkManagerUserSettings': no such name
which is always in the messages log files.

Every 5-10 minutes, I can hit spacebar 4-5 times and I briefly see the login screen then it blanks out. Then you have to wait another say 10 minutes. 

It has a intel integrated graphics mobo chip
lspci
00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation Core Processor PCI Express x16 Root Port (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
00:19.0 Ethernet controller: Intel Corporation 82578DM Gigabit Network Connection (rev 05)
00:1a.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 5 (rev 05)
00:1d.0 USB Controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation 5 Series Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 6 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
[fetus@mu2 log]$


When I look at yum log, I don't see anything graphics related (I think)
Jun 07 04:12:42 Updated: xulrunner-10.0.5-1.el6_2.x86_64
Jun 07 04:12:46 Updated: firefox-10.0.5-1.el6_2.x86_64
Jun 08 05:51:24 Updated: 32:bind-libs-9.7.3-8.P3.el6_2.3.x86_64
Jun 08 05:51:24 Updated: 32:bind-utils-9.7.3-8.P3.el6_2.3.x86_64
Jun 14 05:50:25 Updated: expat-2.0.1-11.el6_2.x86_64
Jun 14 05:50:31 Updated: 1:java-1.6.0-openjdk-1.6.0.0-1.48.1.11.3.el6_2.x86_64
Jun 14 05:50:32 Updated: expat-2.0.1-11.el6_2.i686
Jun 19 04:17:22 Updated: python-libs-2.6.6-29.el6_2.2.x86_64
Jun 19 04:17:29 Updated: python-2.6.6-29.el6_2.2.x86_64

Must be software related. Any advice?
Bill Lutter