Monitor display "shifted down"

Hi,

I'll do my best to describe the problem I'm experiencing. I have no idea what the cause is....I simply turned on my computer a few days ago and the display was messed up. Basically the bottom part of the computer screen can't be accessed/doesn't display. For example, I had to move the taskbar from the bottom of the screen to the top. No matter what I did, it would no longer display on the bottom. On the internet, I can no longer scroll all the way to the bottom of webpages. When I look at photos on my computer, the bottom part of the photos is cut off. I'm not really sure what the problem is but it's almost like the display on the monitor has been "shifted down". I tried adjusting the screen resolution, but that doesn't appear to be the problem. Please let me know if you have any ideas! Thanks!!!