i went to system prefrences and went to display, and accidently changed the resoultion, after clicking it by accident, i put it to 1024 X 768 stretched, but it still doesn't look how it did before, how can i switch this to default?Reset Mac display settings to default?
Almost all Mac settings are stored in a Preferences file somewhere. In your case, the file in question is:
In English, that means that if you double-click Macintosh HD, there will be a folder there called Library. Open it, then in the Library folder, go to the folder called Preferences. Grab the file com.apple.windowserver.plist, and move it to the Desktop.
You should be good.