Can't sign in on external monitor with MBP after Yosemite upgrade

After Yosemite upgrade, when I turn on my MBP, I can't sign in using external monitor with MBP, always could before Yosemite. Blurred image of my wallpaper shows on monitor, can move arrow on external screen but sign-in only shows up on my computer screen, with no arrow. Since there is no arrow on the computer screen, and no sign in box on the external monitor, I have to unplug the external video to sign in on the computer, then plug in the monitor again. Any ideas?

NOWEK,
Thanks for this suggestion, but so far no joy. I have zapped the PRAM, jammed the Frabitz and smashed the Gafrogsnicker, all to no avail. When the MBP restarts I get a blurred image (extreme "vibrancy") on the external monitor, but no images of the login accounts to choose from or the other options. However, on the MBP screen I get all that. The keyboard and mouse respond, but just doesn't display on the external monitor. This is of interest to me because I have the MBP down in a credenza with other related gear and the external monitor and keyboard up on my desk. It's true I don't have to do this often, but still, it just started this aggravation with Yosemite. Thanks for trying to help.

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Good morning Mogens Pedersen
Thanks for using our forum
I am a Cisco network support engineer, I have a recommendation, before you upgrade any device in the future. Always keep in mind to make a backup of your data, in this way if you have to reset the device to factory settings you will not lose that information. Having said that, reset the router to the fabric configuration using the back little button, remember when you do that, you are going to loose your current configuration.
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loading packages...
warning: downgrading package xf86-video-intel (2.99.916-3 => 2.99.911-2)
resolving dependencies...
warning: cannot resolve "glamor-egl", a dependency of "xf86-video-intel"
:: The following package cannot be upgraded due to unresolvable dependencies:
xf86-video-intel
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error: failed to prepare transaction (could not satisfy dependencies)
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Can't sign in on external monitor with MBP after Yosemite upgrade

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