I have a 2011 MB Pro i7 with the new combination "mini display port" and "thunderbolt" connector. I took the hard drive out of my old mac and put it in this one when I got it (since it's an SSD). However, when I connect any external display via the VGA adapter, the desktop on the external display is skewed way to the right. No auto-correct settings on the monitor or tinkering with the display settings seems to help.
Any ideas? Perhaps I need to have the MB Pro "forget" the displays it remembered before?