Screen resolution?
I have learned some possible cases.
*If your monitor cant turn ON, then get urself a new one.
*If your monitor has something wrong with one or 2 or 3 RGB (red green blue) color, then get a new connector cable on ur monitor.
*If your monitor has something wrong with the display, for example;theres a line in the middle, display got wavy or shortened, then there is something wrong with the vertical and herizontal driver.
*If your monitor has something wrong with the display configuration, try adjust the flyback. Normally it has 2 holes. Adjust it with a screw driver, till u got it correctly.
Safety precaution: Do not open your monitor while it is ON or you will be electricuted 15k of direct current, which means you cant pull back urself and...umm..just dont do it