Why the Grub menu hangs on physical system after system reboot?

Solution Verified - Updated -

Issue

  • Upon system reboot, the Grub menu hangs. It does not allow to select the kernel and timeout also does not occur. However, when rescue DVD/ISO is used the system boots up normally when Boot from local drive option is used.

Environment

  • Red Hat Enterprise Linux 7.x
  • Red Hat Enterprise Linux 6.x

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