About two or three years ago, I bought an LG monitor (flatron L194WS-SF). Someone has adjusted it so that the screen is vertical, but I like it to slant back slightly because it hurts my neck when it is vertical. I have tried to move the screen so that it slants back, but it doesn't move at all, and there doesn't seem to be a button on it anywhere to loosen it. Can anybody please recommend what I should do about this problem?