Thunderbolt -> DVI -> HDMI projector issue

Discussion in 'Apple TV and Home Theater' started by nightfly13, Jul 31, 2011.

  1. nightfly13 macrumors 6502a


    Jul 17, 2008
    Ranchi, India
    Not sure this is the optimal sub-forum.. but here goes..

    Right so I upgraded from an old Mac Pro (that had DVI outs) to a fancy 27" iMac and I love it - but I'm having trouble with getting my 720p projector (Mits HC1600) to cooperate.

    I have a fair amount of hardware lying around to test with, which pretty much assures me that it's an Apple software problem. Booting to Windows will likely confirm as much.

    So on my 27" iMac has 2 TB ports. One uses the (USB-bus enabled) dual-link MDP-Dual-Link DVI adapter for my 30", and the other port has a new Monoprice MDP-DVI adapter. That connects to a 30' DVI cable (that's worked great for years) to a DVI-HDMI adapter on the end. I thought maybe somehow the MDP can't support the long cable run, but I just climbed up with a MBP that has MDP out and a 6' DVI cable and had the same result. Here's what's weird, though: the computer 'sees' the projector just fine - even reporting the model number (HC1600) in display preferences. I can change resolutions and 'arrangements' and everything. So the both Macs know they're connecting and are outputting a signal, but the projector never receives these signals.

    The MDP-DVI works fine to the two LCD monitors I've tried it with. My PJ doesn't have DVI in, obviously. I might need to go back to analog, which would be very irritating (where is that VGA-Component cable....).

    Guess I'll be slumming, watching movies on the 27" tonight :)

    Input appreciated!
  2. nightfly13 thread starter macrumors 6502a


    Jul 17, 2008
    Ranchi, India
    No-go in Windows...

    Hmm booted over to Windows 7 - I could change every conceivable setting on the iMac and 30", but nothing got through to the projector - and yes, the pj input is set to HDMI.

    *head scratching*
  3. davidwanat macrumors newbie

    Feb 26, 2012
    Also have problems

    I'm having a very similar problem.

    mid 2011 iMac 27" > Apple thunderbolt to DVI adaptor > DVI cable > projector = no signal. (it may flash on for one second then disappears)

    If the hook the exact same setup to a monitor (instead of the projector) it works.

    I've tried two different Thunderbolt to DVI adaptors, I've tried a new (mid 2011) MBA 13". Neither work.

    If I hook an old MBP 17" to the same cable and projector it works fine.

    Why doesn't my brand new iMac or MBA work?????
  4. technologyfan macrumors newbie

    Mar 25, 2012

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