CentOS 6.4 VirtualBox VM won’t boot up after doing an update/upgrade!!!

Often times, I employ a CentOS VirtualBox virtual machine (VM) as a development, testing and staging environment, I love the flexibility of virtual environments for testing and development work before moving my work to production environments. Recently I ran a yum update and yum upgrade on a CentOS 6.4 VM and subsequently rebooted it, only to be greeted by a blank screen following bootup. A quick search of virtual TTY terminals yielded a login

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