我用S端子连接了电脑和电视,同时还有一个DVD机也连接了电视,为什么看DVD时,显示黑白,而且没有声音

你换一下制式，你的DVD是不是NTSC制的，要把你的DVD和电视的制式调一样了就有色了。
答案补充
你要调一样了，DVD显示什么制式你就把电视调到什么制式，你用视频线看有没有色呀，要是没有你再换一台机子看是电视还是DVD机坏了。
答案补充
一定有，你看一下说明书吧，要么你接数字口，就没有制式一说了。
答案补充
你先查一下是不是你的DVD机的事要么就是你的盘就是黑白的。

应该不会出现你所说的抢信号的问题
你首先要确定，在用S端子连接电视的时候，你电视的收看应该在S-video页
看DVD时，应该在你接的信号页，例如在AV1\AV2\分量、HDMI等，信号选择项一定要正确。出现这样的情况，一般是信号源选择不对。

如果我说的对，给点分呗

的确存在抢信号的问题。虽然电视机有4路AV输入，但S端子其实与一路AV共用一个通路。一般为AV2，AV3则是与色差共用。所以说如果你发现有冲突的话，把DVD的输入换一路AV试一下，应该就没问题了。

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