Just ran the FREAK security update, and now iMac won't boot

Hello,
Gto major issues here after running the above security patch. I'm on the latest yosemite, on a 2007 iMac, 2.8 extreme. Anyway, the software update seemed to go ok, but, as I always do after updating software, I booted into the recovery drive and ran disk utility. This failed when checking the catalog with an error that the dick couldn't be repaired, back up and restore my files. Exit code 8 ...
when hen I rebooted, the progress bar on the grey screen gets to about a quarter of the way across, and the machine just shuts down.
starting in verbose mode tells me the volume could not be verified
localhost.com.apple.xpc.launchd[1] < Emergency> ...
kext loading now disabled
kext unloading now disabled
kext auto unloading now disabled
kernel requests now disabled ...
killing all processes
cpu halted
and thats it.
Id appreciate any suggestions.
cheers,
kev.

Hi again,
when I ran AHT yesterday ( the short version ) it said there were no problems. However, when I tried the extended test, it froze after about 20 minutes. That reminded me of a previous issue I had with this mac, when the power supply failed : very worried about my 2.8ghz 24in imac
When booting up now,  the the mac gets to the grey screen with the Apple logo, and the progress bar gets to about a third of the way across before shutting down. Im now wondering if the power supply has gone, rather than the disk ...
any thoughts on how I could diagnose this one way or the other?
cheers,
kev

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