Hi guys I wonder if you could help me, this has just started happening in the last hour, I'm getting a black screen which you get when your closing down,it only lasts a couple of seconds and a small blue screen in the middle of the black screen which again is just like when your closing down.its starting to happen once every 10 min. to me it suggest a loose cable maybe going into the monitor ? anything else I should be checking.any help would be appreciated