Infocu IN76 projector

After some hard labour I now have a fully functioning home theatre setup - including macros that select Lovefilm etc on my Smart TV - but with one exception: I just can’t get my Infocus IN76 projector to work properly.

I can switch it on ok but thereafter it won’t respond except - weirdly - if I select “power saving” in the projector’s menu to on then off (using the original remote).
This is not a fix though as it only works once.

Anybody had any luck or know anything about this projector that might help?