Login on not visible on second connected screen

May 2, 2008
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I have 2 screens connected as sometimes the main screen doesn't work.
The expense to repair the faulty screen 27inch iMac isn worth it. ($900)

After upgrading to Yosemite I now only login via the faulty screen. I don't want
to do this and at some point will not be able to.

The login icons don't appear on the second screen, however when I move the cursor across the width of the faulty screen to far right,
on the 27 inch Imac, the cursor finally appears on the second screen.ie far left
ie the second screen is an extension of the first.

I have mirroring option ticked in system preferences.
This process was fine in Maverick , until the Yosemite upgrade.

I need to log into appear on the second screen (21 inch)
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