Monitor doesn't display correct resolution/aspect ratio - black bars on side

My monitor has been working fine for at least 2 years, and my brother was using it (I'm not sure what he did, he was trying to press Alt+Tab and forgot the combination) and all of a sudden the screen looks like that. The software side is fine, the resolution is set to 2560x1440 yet it looks as if it's a 4:3 aspect ratio, at like 1600x1440 or something. I tried the VGA input instead of DVI and it looks the same. When I boot up and go to the BIOS, it also looks similar, but I'm not sure if the BIOS supports widescreen. No options in the OSD offer any help. Consequently I feel like it's a hardware issue but I'm not sure. It's not the cable, because VGA did the same thing as DVI. Could it be my GPU?? Do you guys have any suggestions?
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More about monitor display correct resolution aspect ratio black bars side
  1. Go into your monitor settings and do a factory reset. Your monitor is actually a 1440 resolution one correct? What is the model of it?
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