No longer auto detecting monitors

I've connected my MBA to another DVI display and everything was OK. MBA detected the manufacturer and model. For some reason, I've for Detect Display and MBA no longer identify the other monitor. I've tried to reboot both MBA and projector, without results. Any idea?? Thanks and sorry by my english!

It looks like manually deleting my whole preferred network list and then re-adding my home network may have done the trick.

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