James, I've had a number of projectors, and have always left the main power switch on and used the on/off button on the remote or the projector. Someone may have another opinion, but I think that's generally safe. If you know you're not going to use the projector for a while they you might as well turn off the main power switch. Hope that helps.
I have wondered the same thing, because on my lcd projector when I just turn the power off with the remote, the fan will never stop. After a couple minutes it slows down but it never completely stops spinning.
What I've been doing is, first I turn the power off with the remote, then I wait a couple minutes until the cooling fan slows down, wait a few more minutes until the air coming from the projector feels cool, then I just turn the main power switch off.
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