Hi, I just got myself a new monitor. It only has D-Sub as input so DVI/HDMI is out of option. I have been happily using an old monitor with a mini displayport - d-sub converter so I used the same configuration. The problem is, once i set the resolution to 1920x1080, at first the monitor shows `no signal`, after a few secs the display is up but with glitches every now and then. After a few minutes of usage the screen goes nuts. I'm on late 2011 macbook pro. Any ideas?