>> I would also run "memtest" off CD #1 for a couple of hours to >> make certain that memory is working OK, etc. > > I rebooted into rescue mode but can't find memtest, only memtest-setup. No, you boot up *with* CentOS CD #1 in the CD drive. At the "boot:" prompt (where you normally just hit <ENTER> to install CentOS), type: memtest86<ENTER> It will run memtest off the CD. johnn