Changing Display settings to 1440 X 900

Most TVs won't run at 1440 x 900 since that is a computer monitor resolution. That is likely why the mini isn't offering it as a choice.

I have my Mini working with my monitor at 1440x900 so I suspect that either your TV is not capable of this resolution or your Mini does not think it is.

What kind of TV is it?

While not universally true, it is generally the case that if the Mac correctly identifies the display it is attached to, it will give you all the display resolutions the display can correctly handle. Thus it would be interesting to know if, when you open the display preferences pane, it correctly shows the display model in the title bar for the dialog. If it doesn't the system is not 'detecting' the display correctly, and thus you'll likely only see a range of broadly generic resolution options.

If that is the case, you may be able to get the system to detect the display correctly by clicking on the 'detect display' button. Sometimes unplugging the display, rebooting the system and waiting until MacOS has loaded and then plugging the display lead back in will also 'fix' this problem.

If the display is being correctly identified but MacOS is still not giving the right selection of resolution settings, you can try using a utility such as SwitchResX ( http://www.versiontracker.com/dyn/moreinfo/macosx/15467) to set it as you wish.

unless you have a full HD tv set, such resolution is too high. Most 16:9 tv provide 1366x768 pixels of resolution. By the way, 144x900 is 16:10, typical of computer monitors.