A warning about using a tv with the mini

My father is trying to use his new Mac Mini with his TV, using the video adaptor to plug into the s-video on his TV. Two problems cropped up; he wanted to learn to use a computer so I bought him Linda.com "intro to the Macintosh" DVD's. He couldn't get a video image with the lesson, though he could hear the audio. I called Linda.com and they said the resolution had to be 1024 (not the resolution that was coming out of the Mini). I had my Dad change the resolution, and he lost the signal from the computer (the video slipped out of sync) and got diagonal lines across his TV. Nothing we could do would bring back the signal so he took it to Fry's today. They traced the problem to the Mini resetting itself to 50 hz rather than 60 (Pal vs. NTSC?) upon the resolution being changed.
They got it set back and advise he not change the resolution. So, be warned, if you use the Mini with a TV, be careful about the above situation. I think Apple should warn new buyers, like my Dad who want their TV to be used for the computer, since Apple is advertising the Mini as something you can plug into a TV.
Also, if you, like my Dad, want to get the biggest text you can on the screen, don't change the resolution to the lowest, simply go to system preferences and go to Universal Access and scale up the text to what ever size you need, so much better. Thank you OSX and Tiger.
Good luck,
Lory
I hope this solves some similar problems I've seen here.

Just to correct a few misconceptions.
1. Regular analogue TVs don't have a fixed horizontal "resolution" - they have a fixed number of lines per field and a fixed number of fields per second. Interlacing is used to combine two fields into a single frame. Analogue TV is not based around pixels or samples - so the horizontal resolution is not fixed. However there is a typical maximum resolution that can be carried - and these days broadcast TV is produced using digital standards based around the analogue standards - and this factors this in.
2. Not all of the total number of lines in an analogue TV system contain video information (some lines are used for synchronising information - and there needs to be time to allow the electron beam to return from the bottom to the top of the screen) To add to this there is an additional issue in that not all of the total number of lines containing video are typically displayed on a regular TV due
3. There are two dominant analogue TV line and field standards.
* 625 lines at 50 fields per second. This is used in Europe, Australasia, parts of South America, and large sections of the Middle East, Asia and the Far East. Both PAL and SECAM colour systems are used - in varying flavours.
The 625/50 system contains 576 active lines of picture information, so is also often described as 576/50.
If you consider 4:3 (i.e. regular shaped screens) then the square-pixel resolution that fits this is 768x576 - and square pixels are what computers usually like to deal with.
In broadcast terms - both 4:3 and 16:9 image are based around a 702x576 non-square pixel resolution contained within a 720x576 digital structure. (720x576 is slightly wider than 4:3 or 16:9)
* 525 lines at 60 fields per second. This is used in North America, Japan, Korea, parts of South America etc. It is widely used with NTSC colour systems - though Brazil uses a variant of PAL.
The 525/60 system these days uses 480 lines of resolution (originally it used a few more - around 483) - so it is often described as 480/60.
In square pixel terms a 480 line 4:3 image is 640x480 resolution (our old favourite!)
In broadcast terms the 4:3 and 16:9 images are sampled within a non-square pixel 720x480 structure. I'm not clear whether the 4:3/16:9 is now based on a 480 or 483 or 486 line image - so not clear as to the exact frame that equates to the analogue 4:3 or 16:9 image.
Sure TV Output hardware itself may scale a Mac or PC video output to 720x480 or 720x576 for output purposes - as these resolutions are typically what consumer electronics kit runs at. However to state that a TV itself runs at a fixed horizontal resolution isn't accurate - if the TV is analogue it just has a limit to its horizontal resolution - not a fixed value.

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