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make sure the 'VGA' lead is plugged in properly. if still dark turn up the brightness on the monitor. if still dark after that, go onto the computer settings and turn up the brightness on the display settings.
Your monitor's power supply is probably bad. If your inclined, you can pry apart the monitor shell and replace any bulged capacitors you see on the power supply. Replacement capacitors are available from mouser.com.
If the screen is lighting up for a fraction of a second when you turn on & then goes dark, this indicates a fault either with the backlights on the screen or the inverter part of the monitor. You can check the backlights if you have access to a backlight tester, you need to remove the rear cover & connect the backlight cables into the tester, if this checks ok then look for a problem on the inverter board, checking the capacitors for any signs of distress.