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Were the reboot diagnostic screens that showed on the TV, diagnostics for the BenQ, or for the TV ?
What HDMI ports on the TV have you hooked the HDMI Inputs up to, please?
Make sure the TV settings have not changed. (A TV is involved, isn't it? please explain that part of the setup a bit more.)
Earlier you said, " The projector showed the reboot diagnostic screens but when it was time for the tv picture to appear I got only a blue screen. "
so that's why I have to ask, how is the TV involved, or hooked up, etc. ? or is it a 'TV program' rather than a physical TV, you are speaking of?