OS X Yostemite Boot camp recovery

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May 23, 2014
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I have a mid 2010 iMac running 0S X Yosemite.

My system specifications are:
iMac (27-inch, Mid 2010)
Processor 2,8 GHz Intel Core i5
Memory 16 GB 1333 MHz DDR3
Startup Disk Macintosh HD
Graphics ATI Radeon HD 5750 1024 MB
Serial Number W802710NDB5

Yosemite has managed to lose my boot camp twice. The first time I reverted to a time machine backup of OSX Mavericks and rebuild my boot camp from a Winclone image (Windows 8.1 Pro). I then upgraded back to Yosemite and all went well for a month. On Friday we had a power outage and my boot camp corrupted so that it is no longer bootable. I can see Windows in Finder but still not boot to it.

I tried the advice partitioning - Windows detects GPT disk as MBR in EFI boot - Super User and https://discussions.apple.com/thread/6611265. I have also wiped the boot camp partition recreated it (using Disk Utility under OS X Yosemite) then restored the Winclone image. As EFI Booting from Windows 8.0 Pro is not supported on my machine apparently. I have now reverted to a single OSX partition.

Any assistance in getting a boot camp under OS X Yosemite on my machine without first reverting to a previous OS X, would be appreciated.
 

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