Flickering LCD Monitor Problem – 2 Ways to Fix a Flickering Monitor Screen

  1. Try tightening the cable connections that lead from the PC to your monitor
  2. If this doesn't work then the flickering is because the backlight bulb is failing
The backlight is a cold cathode fluorescent tube (CCFL tube) powered by a 12V inverter. Rather than junk the whole monitor when it starts flickering, you can buy a new backlight for $10 or less.

Simply replace the old bulb with a new one from Ebay or other LCD parts stores. This should fix your flickering monitor problem cheaply.