What do I have to do for my projector to pick up the signal from my laptop when the message,'frequency out of range' comes up? I used to find that if I pressed fn and F5 a certain number of times it would eventually work (the 'frequency out of range' message would appear if I pressed them just once). I don't know what has changed, as I'm using the same computer and projector, but now no matter whether I press them once, twice, three or whatever number of times the message 'frequency out of range remains'.