Please capitalize where necessary: why, consider what it means!
A: Why, consider what it means!
Q: move the arrow in the screen area section to change the resolution.

A: Move the arrow in the Screen Area section to change the resolution.
Q: press and hold down .
A: Press and hold down .
Problem: in some cases parts must be ordered in matched sets in order to maintain the specified accuracy and performance of the instrument after repair.
Can you repeat this sentence, but capitalize it?
Answer: In some cases parts must be ordered in matched sets in order to maintain the specified accuracy and performance of the instrument after repair.
Text: so i present to you the project of a spaceship, which can be evacuated from the planet at least a small group of people who are able to reproduce, - concluded the professor.

Correct capitalization: So I present to you the project of a spaceship, which can be evacuated from the planet at least a small group of people who are able to reproduce, - concluded the professor.
Q: our 'user' machines run, in approximate order of descending number, windows, riscos, linux (debian, red hat, mandrake), macos, hp unix.

A:
Our 'user' machines run, in approximate order of descending number, Windows, RiscOS, Linux (Debian, Red Hat, Mandrake), MacOS, HP Unix.