IMac late 2009 i7 2t HDD, Grey screen problem on rebooting, tried all support recommendations inc re installation of Yosemite,  now about to wipe HDD backing up from time machine would like to go back to mavericks on this 2 days before help please

OSX Yosemite gray screen at startup, tried all Apple Support recommendations inc reinstall, now need to wipe HDD backing up from time machine, would like to backup 2days before Yosemite installation ie Mavericks help please

Do a backup, preferably 2 seperate ones.
Revert to a Previous OS X
Revert Yosemite to Mavericks
If you do revert, I'd use Setup Assistant to restore your data. This process takes a while, so do it when you won't need the computer for several hours, based on my experience.

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