Login screen mirrored displays

[Mark1102]

Hey guys

I have managed to get my Hackintosh updated to Yosemite using a clean install and everything is working. However when I reach the login screen my 3 displays are mirrored until I login, once I login they go back to being extended. Also each time I reboot an extra desktop is created on my main display.

Any help would be appreciated

Thanks
Mark

 

[therisingking]

Hey guys

I have managed to get my Hackintosh updated to Yosemite using a clean install and everything is working. However when I reach the login screen my 3 displays are mirrored until I login, once I login they go back to being extended. Also each time I reboot an extra desktop is created on my main display.

Any help would be appreciated

Thanks
Marl

I'm having the same problem, I was able to fix it once but then it went back. Still trying to get it to fix.

 

[Mark1102]

How did you manage to fix it? I'll see if it works for me

 

[therisingking]

Dont remember exactly I was just messing around and it changed. It went back to the mirror screens now. I'm using a GTX 770 4GB.

 

[Mark1102]

Anyone else got any ideas?

 

[therisingking]

bump

 

[nickpook]

I am having the exact same problem and am also using a 770. I have noticed that if one of the monitors is turned off when I turn on my computer and then turn the monitor on when it gets to the login screen it resets all of the monitors and they are as they should be.