I purchased a used Mitsu HC 5000 not long ago and in mounting it and hooking it up I noticed that on dark screen there are several green globe looking items speckeled on the screen. I assume this is dust internally in the light path but is there a way to clean it?

Got a wierd one here. I have had the HC5000 since mid year and watch standard DVDs on it every second night. I have 2 dvd players in the home: my original Pioneer DV-360 (UK model) and newer Panasonic DVD/VCR combo unit. After much testing and swapping, I had to resort to the trusty Pioneer connected via S-Video as opposed to the Panasonic on Component. I am really baffled. I have an eye for detail so can tell the differences - what baffles me and I am looking for input from others - the colours (or perhaps contrast) from the Pioneer S-Video connection is better in view than the component from Panasonic. The Panasonic's component picture where blacks are concerned is quite washed out. (All this without adjusting the settings on the HC5000.) True the detail on Component is noticeable and in A-B comparison more detailed (likely just better definition around edges which sums up as a better overall picture detail wise - this is Component's domain anyway). However colour/contrast wise it doesn't seem to match the S-Video ... FInally the Component picture has interference (?) pattern of diagonal lines slowly creeping across the picture. Enough I reckon to affect the overall picture. This is absent from the S-Video picture and I think this is what is affecting the component picture - at least the first thing to eliminate. I have tried all settings on the HC5000 but none eliminate nor improve the lines - its like a mismatch of synch or something. Even if I can increase blackness for Component picture, this lines thing still prevails and dilutes the overall picture quality. I expected Component to be S-Video and a bang lot more. Has anyone experienced this before?

First off, this site and the forums are AWESOME!!! Thanks to all for the continued input and information. I am researching projectors for a theater room in my basement. In doing so, I came across the Mitz HC5000. On the Mitz web-site, there is a calculator available for download which enables you to enter in all your room characteristics ... ceiling height, screen size, etc. in order to obtain what Mitz recommends for mounting distances. With the HC5000, it shows that at a throw distance of 13' for projection on a 119" screen with a 16:9 format, ceiling mount (ceiling height of 7'10" or 94"), the mounting arm needs to be anywhere from 27" to 62" in length. At that length, the projector will hang right in the middle of the room. Ideally, I would only want a maximum of a 6" mount arm. Is this correct or has anyone had any experience with this projector mounted much closer to the ceiling? Thanks.