Progressive Scan - don't press the button
Having bought a new DVD player for the kids, for some reason it didn't display anything even though we bought a new SCART cable. Hence we returned it to the shop who also could not get it to work.
We replaced it and I watched the kids install it. The first question it asks is whether or not to use Progressive Scan. Had it said Progressive or Interlaced then I would have had some idea what that means. However, I thought it was scanning for channels so we said yes.
The end result was that the display again stopped working. Having resorted to RTFM it turns out that it is a different approach to the lines on the screen. Luckily by random pressings of the "pscan" button it stops. The manual said "press three times". That didn't really work. But some random pressing of the button linked with an element of cosmic ordering (or hoping) did elicit a display.
The lesson of the day is that if the DVD player says "do you want progressive scan" the answer is No.
Don't press the button!