Computer eyeshade cut sour at edges?

at a fickle time my computer screen get cut off almost an inch on each side and is very soon just black, the resolution have nothing to do beside it i found out by changing it only just for some reason think my monitor is smaller than it is.. even if i up the resolution so part of my desktop is bad screen it doesnt appear on the cut past its sell-by date edges..

somebody please help

Answer:
Adjust horizontal setting on the monitor.

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