Connecting ATV to SP4805 Projector

Has anyone had any success connecting AppleTV to Screenplay SP4805?  I have spent several hours to no avail: tried all settings, also flashed the 4805 to latest firmware 1.3.2.  The projector does not recognise any signal from the 4805.  I have set the output to 720p which I know should work.  I am using an HDMI lead with a HDMI-F to M1DA-M adaptor which works perfectly with the signal from my DVD player.  Has anygone got any suggestions?
thanks,

Just checked the 4805 specification sheet (link):
COMPATIBILITY: Component and RGB HDTV (720p, 1035i, 1080i). DVI with HDCP for digital video and encrypted digital video. Component EDTV (480p, 576p progressive scan), Component, Composite and S-Video standard TV video (480i, 576i, composite SCART with adapter, NTSC, NTSC M 4.43, PAL: B, G, H, I, M, N; SECAM: M).
so Alley_Cat: yes, the 4805 should be HDCP compliant. 
I wonder if the problem is therefore the HDMI cable or the HDMI-M1 adapter but as I said above, both work with output from my HD DVD player.
I even preset the output from the ATV (AppleTV) to 720p in case the Auto setting was preventing a handshake.
Anyone else got any suggestions?

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