My LCD Monitor is blinking on & off constantly

The problem is more than likely the caps in the powersupply have gone bad. What you need to replace are 3 470uF 25V (you can use 470 uF 35V caps too) capacitors on the power supply circuit. Yes, you will need to bring out the soldering iron, no it is not terribly difficult to unsolder them. There is a longer thread on here (search under vl1918) for more info in which I posted a solution that has worked for most.

It may need a different outlet, if it is not getting proper power. Small chance that the video cable has gone bad, but more likely the monitor is damaged. But try those two things and call Princeton.