Flatron Wide Lg Flatron Monitor Takes Ages To Turn On, How Do I Fix It?

Lg flatron monitor takes ages to turn on, how do I fix it? - flatron wide

I have three years to monitor, LG Flatron wide, that worked very well until two days ago when it was still a short climb. Since then, the screen does not attempt to, and flashes of blue light and outside (sometimes it is purple) about 2-5 minutes later, when finally, the screen lights up and perfect (works until the entry into standby mode or turned off) . So what's the problem?