Macbook External Display no Signal 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.
Here are some troubleshooting steps that I would try:
Reset the System
Reset your Mac's parameter RAM and SMC
Try another Cable
Although you are using the official MiniDVI to VGA adapter, it is possible that it might be damaged, so I would try connecting your monitor with another official adapter.
Reset the Resolution

Start up in Safe Mode (Power + Shift on startup)
Apple Menu =&gt; System Preferences
Choose Displays from the Views menu.
Select another resolution and refresh rate.
Restart.

Software Update
It is also possible that you need to update to Lion (Maybe even Mountain Lion if you want).
Other Links and Resources
Another Apple user who was using a Powerbook with the Acer x163W had issues too. That question was answered here and recommends a different monitor because of the Acer monitor's lower resolution than his Mac.