Screen URL background pink word background green

ackack Posts 1 Registration date Monday February 16, 2015 Status Member Last seen February 16, 2015 - Feb 16, 2015 at 10:52 AM
I tried hooking up an old moniter to my laptop. Ever since, my laptop screen has pink or green backgrounds where it used to be white. Is there a display setting (resetting?) in control panel? win 7