MacBook Pro retina and external screens

I connect my recently arrived 15" MacBook Pro retina to one of three 24inch Led displays which I use at different work locations... On two occasions on start up the external screen did not turn on. Power is on, USB not, led display is off, System preferences Displays module finds it... but there's not way to turn the screen on. Next day the very same screen turned on without anything particular being changed. Today I've not been able to turn on another of these screens, yesterday the third screen functioned beautifully more than 12 hrs.
Any suggestions about why this may be happening?
Thank you

Eventually I got so annoyed I tried going back to a time machine backup when everything was still fine. (restoring Mac OSX to a time when the issue occured did not help). That worked, however it would be nice to know how to reset the display settings without losing progress.

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Message was edited by: Twitcheye

Hey! so i was do a AHT on my macbook pro retina and their was a error 4SNS/1/40000001:1DOR-0.000 need help thanks!

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Welcome to Apple Support Communities
It looks like you ran Apple Hardware Test without plugging the MacBook to the charger. It's normal to see an error if you run Apple Hardware Test without your Mac plugged.
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MacBook Pro retina and external screens

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