On Sun, 2009-03-08 at 09:16 -0400, Richard Karhuse wrote: > On Sat, Mar 7, 2009 at 10:00 PM, Rick <ellis at spinics.net> wrote: > > Since memory has become quite cheap lately I decided to move from 2 > > GB ... > Forth, what (precisely) CentOS kernel are you booting?? Does it > support greater than 4 GB of RAM?? Lots of good suggestions, but this would seem to be a likely cause, and easiest to check. If you are running i386 you need a PAE kernel. http://wiki.centos.org/FAQ/CentOS5#head-d70935212ce3b7b072b0075c1807a4bd3ea175b7 Phil