Answer by  
                                                                                          ElectricDave (80)
                                                            
                          
                          
                                                           There are a few simple steps for troubleshooting this problem. First, on both the monitor and your computer, verify that the monitor cable is connected properly, as a loose connection may cause flickering. Verify the monitor and video card drivers are up-to-date. You can also verify that the monitors refresh rate is not set too high.