I use MBP 13" early 2011 and tried to connect with external moniter ACER X163w but the monitor displays a "no signal" error.
I use official cable Display MiniDVI to VGA and run OS X 10.6.8.
Might the external monitor be too small or how else can I troubleshoot this?
[Update] I have tried on my bigger monitor 25". Still says no display. it seem the problem is with my current OSX. I searched in google, some people also have same problem.