Hi, Have have replaced my lamp on a H56 and can't work out how to reset the lamp counter. I have looked on the web and contacted the service agent who said it is located under the managment menu.... can't find a managment menu. Anyone able to help please?

I have an Optoma H56 projector that is fully HDTV compatible (native XGA). I have a Samsung H260F HDTV receiver (cable/over the air) that I connect to the projector with a HDMI-to-DVI cable and it works wonderfully at all resolutions. This week I signed up for a Comcast HDTV account and they delivered a Motorola DCH3200 high definition box with HDMI output. I connected this to my projector with the same HDMI-to-DVI output (and RCA cables to stereo for audio). I get sound through the stereo just fine but only a black screen from the projector for video. Some type of signal is coming through because the projector indicates that it is receiving a signal on the DVI -- but the image is entirely black/blank. It makes no difference which resolution output I select on the receiver. Ideas/help much appreciated!