Try this first.. 1. Boot from CentOS installation disc (for example, CD #1 or DVD). 2. For CentOS-4 or CentOS-5 type "linux rescue" at the "boot:" prompt. For CentOS-6 pick "Rescue installed system" from the boot menu. 3. Mount all filesystems in read-write mode. 4. Change root to real root ('/') on your hard disk: 5. # chroot /mnt/sysimage 6. Re-install bootstrap code (GRUB). * If you wish to re-install GRUB to the MBR on a SCSI or SATA disk (/dev/sda): o # grub-install /dev/sda * If you wish to re-install GRUB to the PBR of Partition #2 on a SCSI or SATA disk (/dev/sda2): o # grub-install /dev/sda2 * If you wish to re-install GRUB to the MBR on an IDE disk (/dev/hda): o # grub-install /dev/hda From: app_rpt-users-bounces@ohnosec.org [mailto:app_rpt-users-bounces@ohnosec.org] On Behalf Of John (WB5NFC) Sent: Friday, February 03, 2012 11:21 AM To: app_rpt list Subject: [App_rpt-users] ACID Boot Error Help Request My trusty Acid server bit the dust last week. This is full-size Dell with plenty of horsepower and a quad radio interface, not my BeagleBoard. The computer goes through POST with no errors reported, then: grub loading stage 2 GNU grub V0.97 [Minimal BASH-like line editing supported. I think this happened after a brief power outage, but I'm not sure. Just just noticed the nodes were down and then found a computer that would not reboot. Suggestions for troubleshooting, please? John / WB5NFC