IMac, update causing black screen and randomly powers off...?

I've seen many comment on this with few solutions. It had never occurred until yesterday afternoon after the latest security update for Mavericks, 2014-005 v.1, was loaded and the system was rebooted. After that moment the mac has been unusable. It will start and after user log on, will black screen, sometimes still running and other times instantly powered off. I have followed resetting the PRAM, and SMC procedures with no change and have booted into safe mode in order to examine the system and it is just as unstable there. The times I have gotten it booted and running, attempting to access an earlier Time Machine backup, but before I can start reload it goes black. The same goes while trying to check the sleep mode and security settings. Unless this is an amazing coincidence, I believe the latest update has caused this problem and has for others as I have seen on many conversations. Can this be uninstalled or does the drive need to get wiped and then reload from the Time Machine?
Thanks.
iMac, A1311 21.5" Mavericks 10.9.5 Update 2014-005 v.1

Well, initial call into Apple Care and one answer. "We have no idea what it is, we can get you an appointment at a Genius Bar in 4 days!" 4 days?! Seriously? At least they were kind enough to only put me on hold for 30 minutes, AND then transferred me to a "Sr. Care Specialist" who basically blew smoke up my arse only to tell me the same thing... why transfer me at all?

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IMac, update causing black screen and randomly powers off...?

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