I am not sure what information to provide, if need be, do request what information of the pc i need to post here, besides I'm using another computer. Following with the subject I guess it's a simple problem but not with me. It goes blank right after the windows startup when you switch on the computer. I guess it's a resolution problem but how to change it? I went to safe mode, but it don't happen at desktop properties>settings I recently reformatted the pc when I got it back from ''repair''=they said nothing wrong.. It all started when i was adjusting the screen size. There were 2 corners were slightly out so I tuned an option where reduces the size all round. The screen became smaller and smaller then poof, that was the start of this problem. After the ''repair'', I reformatted like i said, then i installed bitdefender antivirus software. Prior to installing I need to restart right, yeah-that was the second time this monitor turned blank... Any instruction what to do? How to set it using safe mode or something?