Thanks very much for your help. As a layman in IT matters, I think you are asking me for the ports on the back of my Inspiron. These are VGA, DVI - D, and what I think is video in/out - it is a smallish circular port with 6 pins arranged as two rows of 3 pins and has a diagram of a TV screen with an arrow pointing out of it.
As for the projector, on p.41 of the manual, it givesa list ofcompatible signals. One of these is Mode 1125[1080]/50p which has a display resolution of 1920 times1080 with an H scanning frequ. of 56.3 and V of 50.0 - a dot clock freq. of 148.5. Its format is COMPONENT/PC/HDMI. This gives the highest res. but there are lots of other compatible signals listed.
As already mentioned, the HDMI/DVI - D cable does not work. Can I use any to the pc ports to feed into the HDMI port or for that matter any of the ports on the projector in order to get the maximum resolution that it is capable of?
Any help gratefully received and not just from Andy.