I have had an ongoing problem with my BenQ PE 8700 projector. I use a DVI connection on the projector to connect to my HD Cable box. It will work for a while but eventually stops working. I will get the message DVI not supported in the lower right hand corner of the screen. I can reset the cable box and alter the setup in the cable box to work on the DVI setting then the picture will come on the screen for a couple of seconds then go off. I use the component connections for my dvd player so I don't want to switch it back and forth just to get it to work.
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I have a BENQ PE8700 also. Charter Cable just replaced my Hi Def Cable Box and now I only get the non hi-def channels. I get the sound on the Hi-Def channels only. My projector is hooked up with the DVI Cable. Did you ever find out why you were not getting HI DEF?
unless you dropped it, there is no damage to the sensor. it might just be dirty. blow the dust out of the projector with canned air. if there is physical damage, just replace it. if you're sure the remote works but none of the sensors do, it's a main board problem.
I had a similar problem with my Benq 8700+. The aspect ratio would show in the R low corner on changinbg resolutions, and would close down to a single line ("anamorphic" for example) which would remain on the screen. I checked the manual (useless) and went through all the set up screens (again useless). In despiration, I decided to try to unplug the projector and did so for 30 seconds to allow the charge to drain from the circuits powering the chips in the 8700+. Upon returning power and restarting, the screen resolution appears/disappears properly once again. Give thjis a try.