27" imac yosemite update hangs. Required power cycle and safe boot to get the update going. Now all OS X update do the same.

27" iMac Yosemite update hangs.
The original upgrade to Yosemite (10.10) took almost a full day! The computer hung during one of the reboots and just showed a blank grey screen, no apple logo, no progress bar, nothing. I left it like that for about an hour thinking it might be working in the dark... Eventually I had to power cycle. Disconnected power at the wall outlet for about 5 minutes, then reconnected and tried to start. After about 20 minutes, got to the same point, grey screen:no action, again waited at least an hour.
Then I did a safe boot. System came up OK in safe mode to the log in screen. As soon as I logged in, it proceeded with the interrupted update, which ran to completion. Yay!
Now, every update to Yosemite that arrives gives men the same grief!
To add some more, the "Pro Video Formats 2.0.1" update has installed about 4 times, and is asking to be installed again? There's no indication that it fails the update so whats going on?

I saw the set hibernet mode to 0 trick and it failed.  Guess I can try 3 because reinstalling OS X did nothing but cost me another few hours and a little faith in Apple.  Getting annoyed as I see how many people complain of the identical issue and the fixes are variable and random.  Suggests to me that it is a major design flaw in the hardware and Apple got too cute with the just works idea and didn't put a damned power button on the display so there is no manual way to do it and no 'insert a pin here' type trick to reset the thing.
Asking for a refund tomorrow.  Past the 14 days so maybe they'll say no but if so then every time this happens I will swap it out.  At least then I know it is a three hour fix and as I was working on this for hours today it occurred to me that if the trick is to do 57 different things and maybe one will work then that is not why I made the switch to Apple.  I could plug everything in on my PC and it all 'just worked'.
Really poor customer service - the support folks are very nice and I am sure they know that this is a systemic issue but aren't allowed to say so.  Feeling pretty stupid for going on faith right about now.

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