10 Replies Latest reply: Apr 12, 2008 8:52 AM by adriandb
ilovetrainskc Level 1 Level 1 (45 points)
I wanted to use my G4 with my HD TV. My G4 has a DVI out, so I bought a DVI to HDMI cord. The picture began to come up, then the signal from the G4 stopped. Still works with a LCD monitor, but will not go to my HDMI LCD TV.

I tried this iwth my G5 with mixed results. Got signal, but top and bottom of desktop were cuttoff.

Why will this not work with the G4?

G5 dual 2.0; G4 400 mhz; ibook G4, Mac OS X (10.4.8)
  • ilovetrainskc Level 1 Level 1 (45 points)
    anyone have an idea?
  • japamac Level 7 Level 7 (24,385 points)
    Probably not enough graphics card to drive the TV.
  • CEB II Level 2 Level 2 (475 points)
    It takes a Radeon 9600 with dual DVI connection to power a 30" Apple Cinema Display. I'm guessing your HDTV is larger than that and your video card isn't even the Radeon 9600 Pro (256 MB VRAM). That is probably why you can't drive your HDTV with your MDD G4.

    Carl B.
  • cmendill Level 1 Level 1 (40 points)
    HDTVs are not particularly high resolution in comparison to LCD Displays. 32-37" have native resolutions around 1200x700, and they should not require dual channel DVI. So from purely a data throughput point of view, the HDTV should be a piece of cake for most video cards. But HDTVs work with only a very limited number of resolution and sync parameters and your video card driver may not support them. Look into switchresx to create custom video settings and this tutorial: http://www.avsforum.com/avs-vb/showthread.php?t=751713

    but, be careful! improper settings can damage your tv.

    i have a samsung 32" and i go dvi to hdmi with a radeon 9600xt. I have to use overscan to fill the entire screen, but it looks great.
    good luck
  • Scott Koenig Level 1 Level 1 (30 points)
    I have the same problem w/ a DVI - HDMI cable. I have a 32" Mitsubishi HD and am currently using it with a VGA connection. However, I would like to make use of the DVI-HDMI connection for the higher rez.
    Anyone had success with this ?
  • James Asherman Level 2 Level 2 (265 points)
    Wow, I'd like to get in on this thread, instead of starting another.
    I am considering using my G4 in the family room for video playback. (2001 QS 867-upped to 1.20)
    1.1 g mem )
    My plan is to install a second display card in the PCI slot.
    I have a PCI Radeon 7000 (43Mb) lying around. The AGP card is a radeon 9000.
    Running the TV will be all the 7000 is asked to do.
    O intend to try a simple S or composite to a small monitor first.
    My TV is a big Toshiba rear projector. It supports all the current flavors of HDTV ( 1080-720-520-480 and p modes ) It HAS a DVI connector on it (Pre HDMI).
    Provided I get a 20 foot DVI-DVI cable, can I possibly make this work without blowing up the TV ?
  • cmendill Level 1 Level 1 (40 points)
    I would imagine that if you connect via dvi and your tv shows up in the display pref. then you won't damage it. Find out what the native resolution of your tv is and see if that shows up in display pref. If not, 1280x720 is always a good place to start.
  • James Asherman Level 2 Level 2 (265 points)
    720 is a good place to start. When I get the long DVI cable, that will it.
    Meantime I am going to use the S-Composite output to get the basics working.
    Thanks again, this might be fun.
  • Bedrovelsen Level 1 Level 1 (0 points)
    I have a customer with a g4 tower. He is buying a 26" HD tv and wants to run dvi-hdmi into the TV from a Radeon 9200 card. Ive read various reports on hdmi not working or lacking. Would it be best for him to just go dvi into his hdtv or should he upgrade to the radeon 9600? Would the 9600 work any better? I believe its the 1.0Ghz g4 tower with a radeon 9000 pro in it right now. Any help would be appreciated.
  • adriandb Level 1 Level 1 (0 points)
    I'm having the same issue. I'm running my G4 into my 42" Westinghouse HDTV. In the past I used DVI and that worked fine. I'm switching everything to run into an HDMI switcher and this isn't working for the Mac. The image the GeForce4mx is sending to the display stretches beyond the borders of the display. The resolution is set to match the display's native 1080p resolution just as it was when it was running over DVI. Any suggestions?