TV & monitor connected via DVI to VGA & DVI cable. Wont display

I have my TV & monitor connected to my mini via DVI(input) to> VGA(output) & DVI(output) splitter cable. I cant get both tv and monitor to work at the same time only one or the other. How can I get this to work?
Note: I dont want a continuous display, I just want one to show the same as the other. If there both plugged in why dont they both work?

The answer to your question would require having a block diagram of the mini's graphics sub-system. If the DAC (digital-to-analog converter) behind the VGA port is just driven from the same output as the TMDS transmitter behind the DVI port, then I agree it would be possible that both could output the same screen simultaneously. But if the VGA and DVI ports are treated as seperate channels all the way back to video memory, then likely one would be prioritized over the other, only one could be active, and they would not be able to output simultaneously.
Another potential problem is that TVs and computer monitors generally want to run at very different formats and they require different signal types to be happy. A TV will want an interlaced output whereas a computer monitor will not. And a TV will want a very low resolution, like 640 x 480, whereas a computer monitor will be happiest at a much higer resolution.
I hope for you that someone else has this working and chimes in with some practical advice. I try to avoid making posts where I have no practical advice to offer and only bad news, but in this case I thought you might want to know about some potential barriers to success. Good luck.

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