No OS found on disk after reboot

Solution Verified - Updated -

Issue

We installed and updated RHEL6.2 and rebooted many times without failure on a couple of hosts a couple of months ago.
on the weekend both hosts were shutdown and powered up for testing, after this shutdown both hosts are unable to boot with "NO OS FOUND ON DISK"

Note: both servers have connected external disks

Environment

*Red Hat Enterprise Linux 6.2

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