My monitor has a yellow line running down the middle

I had recently recieved an acer h233h lcd monitor, which is a fantactic monitor except for that there are malfunctions, such as, the first one i had gotten had a band of dead/randomly colored pixels running through the center (3 inches long), i had returned that one about 3 1/2 months ago, now i am seeing a thin (2mm long and about in the same spot) vertical yellow line in the center, anyone know how to fix this?