During upgrade screen freezes in white screen

during install of Yosemite my iMac freezes in white screen.

Have you searched for iMac freeze:
http://www.macworld.com/news/2007/11/07/imacfreeze/index.php
There is a known issue that effects some iMacs. Mine worked fine under 10.4 until I added iMac Software Update 1.1 through auto-update. I rolled back to 1.0 and my Mac worked fine again. When I upgraded to 10.5 my system would frequently freeze again.
I took it to Apple, they kept it for 2 days, and then they decided to replace the system entirely with a new iMac. I know of no fix, short of returning the system to Apple.

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