Problem with Hyundai L90D+

Hi folks. I bought a Hyundai L90D+ monitor about 3 months ago. Up until then this monitor has worked flawlessly. 3 days ago, when I tried to turn off my monitor using the power button, it simply wouldnt shut off. When I shut down my computer the monitor would stay on with a blue background(My background when my computer is on). After that I unplugged my monitor's power cable. When I inserted the power plug back in the little LCD light on the bottom right of the monitor was a mix of bluish orangish (blue means the monitor is on, orange means the monitor is on standby). I have no idea whats wrong with my monitor and if any of you know whats wrong I would appreciate it. Thanks.