IMAC freezes @ startup after osx update?

Just getting the grey screen now. Have tried the safe mode startup as well with no success.
Suggestions?

Try booting to the Recovery HD.
Hold option and turn it on, and select "Recovery HD" by moving the arrow on the screen with the arrow keys on your keyboard and then hit return.
OR
Hold CMD+R then turn the computer on. Hold untill you see a "select your language" screen.

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