Unless last ditch can't find anything.
Go back to the drivers you installed years ago. From the card maker or such.
So someone in my house have been messing with my computer and when i came back from school i saw what have happened. My resolution was out of recommended and i couldn't find the recommended one the highest one was 1600*1200 but my display is 1680*1050 and when i put it on 1600*1200 it said something like 75.2khz/60hz out of range. When i saw that i thought it was about the outdated drivers so I updated all of them and still nothing. I ran Windows updater and still nothing. BTW my graphic card is AMD radeon HD 7480D.