Mini Displayport to vga adapter on MacBook pro 13" late 2011. No signal on external monitor

Hi
Connecting a Late 2011 MacBook Pro 13" to an external monitor, trough mini Dispalyport to vga adapter, i see "no signal" messagge on external monitor, even if i get it as secondary monitor on Preferences > Monitor of my MacBook it's visible (i can change resolution, position, clone screen, ecc.).
Any suggestion? somebody found the same problem?

Hi
i did what you said and tried with other resolution/refresh rate combinations, also with anoter external monitor (and vga cable) but its still the same: monitor is detected but there's no signal.
Now I will try to chek if the adapter works on other pc and monitor.
Thanks
(anyway it was the firs time i connect this mac to an external monitor)

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