Why won't my computer turn on

First, is it charged? Second, have you spilled liquid on it lately? Third, has it been acting weird before the problem? Was this random?

If one, then charge it. two, there may be no hope. Three, blown capacitor or bad charger. Four, LCD cable may have disconnected, or the LCD connector may be defective. Open up the laptop, and look inside. Check for any corroded, burned, or plain disconnected things. Clean it, check the solder joints, and try again. If not, it may be dead.