Question on screen parameters for our Mac wizards

[imperialbari]

In short the background is about increasing vision problems leading me to mess with the screen parameters of my 2 x 2.66 GHz Dual-Core Intel Xeon Mac currently running OSX 10.6.7 and driving 4 monitors via two NVIDIA GeForce 730 GT video cards.

Since surgery 18 and 16 months ago my vision now has improved enough to enjoy a much more refined screen set-up. Not that I found out by scrapping my own coarse settings (which is what I cannot find out how to do), but by accident. I was distracted after turning on the computer and only turned on the monitors 10 minutes later and then found a much more detailed view of everything. The delay in turning on the monitors is impractical, and I found a work-around. My system is Danish, but what I would call the screen settings tool allows me rotating one monitor and then letting it snap back at once. That action blows the coarse settings of my own, but only until next start-up.

How do I get back to the default settings right from start-up?

Klaus