I didn’t have much time to look at things this morning. I woke to a warning that startup failed. Startup repair did not work and roll back to two different restores also were ineffective.
I have a disk image so all is not lost but have a couple of days work not backed up, that I would prefer not to lose.
I just got the mac laptop running again this week. There seems to be a limit on the number of computers working in my house.
If you can't get it booted up, you might try downloading one of the 'live' linux CDs. They will allow you to access any files that you might not have backed up, so you can dump them to a thumb drive or something. At least then you can do a clean install without losing any important data. A live CD is one of the must-have items in any geek's toolbox, regardless of the OS they run.
Come to think of it, I did have a problem with a Windows 7 VM I’m running on my Ubuntu desktop. I had to run startup recovery and still had an issue. Thankfully VMWare Workstation has snapshot rollback, and that fixed the issue. I haven’t tried to run the update again. Perhaps that’s what caused the issue.