Monitor trouble

This morning I awoke to my monitor acting up. Instead of the whole monitor working I have an 8" square in the middle that is not black. My entire screen fits into this 8 inch square but it is tiny so I will probably be spending less time online until I get a new one. I am not sure when that will happen as Mike went to get the one we want but the stores are out and we have to order it . So if you don't hear from me, you know what is going on !