i restarted my computer and when it came back on everything was huge. under display properties and then settings the slider won't move and when i went to check my monitor type to see if that was the problem it was set at default and i can't click on the properties button under monitor type.. i don't know what else to try i've checked dell support center and googled the problem but nothing i've found has worked

Please run this scan and post back the results:

http://www.d-a-l.com/hardware-scan.php