Getting square graphical glitches seemingly at random... Cant tell if they are due to a hardware issue or if is it software related... I see them at various places in the OS. Changing what is on screen sometimes makes them go away... Meaning if they show up on the log in screen, they go away when loging in with a user. Or if they are in a application, you can minimize it and they go away, ect... They are also never in the same physical location on the screen or the same pattern... Anyone seen these before?