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Posted 27 February 2013 - 03:33
Posted 27 February 2013 - 03:52
Posted 27 February 2013 - 04:22
Posted 27 February 2013 - 05:00
It sounds like you have a failing hard disk in the machine. The startup process can't complete because some of the files necessary to boot the system are corrupt or inaccessible. From my experience it seems likely that initrd - the initial ramdisk that is responsible for mounting your root partition and kickstarting the boot process - can't mount the root partition because the hard disk it resides on is failing, therefore you're being dropped to a basic busybox prompt. I recommend booting from an Ubuntu live disc and using Disk Utility to check the SMART status of the hard disk. It will likely confirm my theory, in which case you should backup any important data ASAP (if you can mount the home partition).
Check to see if any USB drives are plugged into the system. Unplug them and try again.