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i don't have any LCD on my printrite but it came to my mind this idea:
you said that when you connect your computer, the print start...so the problem might come from repetier host.
Did you try to uncheck the "check temps" in the printer setting?

still in the printer setting, in connexion, there is also an option about dialog between the printer and the pc....

-i'm a newbie too, this idea could be totally stupid...