external display works well on screen, but impossible to get a video

[Amank]

Hello all, I have a worry ... I have a laptop with external display works well on screen, but impossible to get a video.

I tried with another laptop, the video works well.

I will try to update the video drivers, another idea?

Thank you all!

[ThoMas321]

The video projector does not support the screen resolution?
Or simply the video projector does not work?
The output selected is not good? Or was not self-detected?
The cable is no longer good?

[Amank]

I indicated that I did the test with another laptop , so the video market, the output is good, was detected, and cable is good.

I will try with another resolution, the laptop is 1280 * 800, the external display works well with a 17-inch LCD screen.

[deoWo]

puts the laptop in 800x600 or 640x480 ...

[Amank]

With my laptop in 17 ", when I plug in the cable videopro, it detects new hardware, namely, a screen plug and play, but pressing Fn + F4 just say that there no external display

What makes them work on other portable and not these two? Cable videopro too long?