Hi All, This is a Centos 6.4 system used as a home server and Myth backend machine. It has just suffered a motherboard failure and I have got a identical replacement. This machine normally runs in run level 3. It has a NVidia graphics card and the NVidia driver installed but I found it crashed the machine as soon as I started X on there. So I never bothered with X and left it in RL3. So as part of the re-commissioning of this machine I decided to remove the NVidia driver and go back to Nouveau. I shouldn't have bothered. Even starting in RL1 it kernel panics at bootup toward the end of the boot process. If I boot it in level 3 all the daemons start and it runs a little bit of script I have in rc.local to enable ACL's and then panics. The panic is something like panic occurred, switching back to text console. general protection fault: 0000 [#2] SMP last sysfs file: /sys/devices/virtual/block/dm-5/dm/name CPU 1 Modules linked in: "........list of modules......." Pid: 147, comm: plymouthd Tainted: G D ------------------- 2.6.32-358.6.2.el6.x86_64 #1 Gigabyte Technology Co., Ltd P43-ES3G/P43-ES3G There's a list of CPU registers and a call trace after that. I have a photo of the screen if that information is useful Any idea how I can trace this. Many thanks Ken -- Ken Smith K-Net Technology 020 8651 5722