Can not change resolution

Hello, I been having some problems with gnome since like 3 weeks ago. First when I runned a system update and after some restart the clock and date dissapeared, so I needed to move the bar to a side to make clock and date appear again.
Some days later after another update, that error was fixed.
Now some days ago after another update, problem was back again.
So after shutdown the computer and start it again for a maintenance the screen resolution changed to lets say 640x480 instead of like 1200x900 for example.
Is there any way to get it back?. Thanks in advance.
 
Problem is solved, needed to modify the xorg.conf adding the frecuency of my monitor. Seems some update crashed it.
 
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