I have a three-year-old LG Flatron Wide monitor which worked perfectly, until two days ago, when there was a short power surge. Since then, when I try to turn on the monitor, it doesn't turn on, and the blue light flashes on and off (sometimes it turns to violet), until about 2-5 minutes later, when the monitor finally turns on and works perfectly (until it goes to sleep mode or is turned off). So what is the problem?