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Windows 7: External Display won't work

14 Jan 2010   #1

Windows 7 Professional x64
External Display won't work

I'm fairly certain this is a driver problem, but I still haven't been able to solve it.

Before upgrading to 7, I was using my laptop as my primary dvd player, since I didn't have on. I'd hook my laptop into my TV using a an S-video to Composite, extend the display and play the movie. Worked every time.

But after installing 7, I haven't been able to get my TV to display the signal anymore. When I've got the cable plugged in, the computer recognizes that I've got another monitor set up, and it gives me all the options (extend, duplicate, etc.) but my TV doesn't show anything other than a blue screen (the default when it isn't receiving a signal).

Since I thought it was a driver problem, I downloaded the latest drivers (released last month) for my card (nVidia GeForce 8600m), but even after install I still don't get a signal on my TV.

Unfortunately I don't have another TV or computer to test the connection with, but before the upgrade I was using the same computer, same TV, and same cable, so I know it's not a hardware compatibility problem.

The computer says its outputting a signal, but the TV says it isn't receiving one.

Any one know how to fix this?

My System SpecsSystem Spec
14 Jan 2010   #2

Windows 7 Ultimate x64

a shot in the dark, but try connecting the tv to your computer before you turn the computer on.
My System SpecsSystem Spec
14 Jan 2010   #3

Windows 7

I am having this same issue... however, I am able to extend the display if I change the Multiple Displays option to Duplicate and apply changes, then go back to Extend these displays.

However, I have to do this upon every reboot, so it is extremely annoying.
My System SpecsSystem Spec

14 Jan 2010   #4

Windows 7 Professional x64

Thanks for the replies, but unfortunately it's a no-go.

Connecting the tv to the laptop before turning the laptop on doesn't seem to change anything, and I can't even get the TV to duplicate my laptop screen, either.

Don't know if this helps or not, but my TV is definitely getting some kind of signal. Whenever I change from one option to the other (say, from "Duplicate" to "Extend" or back) the TV screen will blink once, much like the laptop will, only I still don't see anything other than the blue screen.

Saebinz, be glad you can get it to do that, cause I can't get it to display anything at all.
My System SpecsSystem Spec
15 Jan 2010   #5

Windows 7 Ultimate RTM

Are you sure you are selecting the correct input on your TV? Most have the ability to use RGB (VGA) or Composite plus HDMI if you have that capability from your computer. I can send my Desktop to a LCD TV using a USB dongle and a wireless USB receiver connected to the TV. It may require some tinkering, but what on a computer does not? Good luck.

Jim Pickering
My System SpecsSystem Spec
15 Jan 2010   #6

Windows 7 Professional x64

Yeah, I'm using the correct input, and it's the exact same one I was using when I had Vista installed. I have an S-Video to Composite cable.
My System SpecsSystem Spec
20 Jan 2010   #7

win7 home premium 32 bit and ubuntu 9.10

I am having the same problem, brand new computer hp dv6-1375dx. I will follow this thread, hopefully we will figure it out.

On a side note, with my set up I installed Ubuntu as a dual boot and ubuntu allows me to use my TV but win7 doesn't (with the exact problems descibed above)
My System SpecsSystem Spec
04 Sep 2010   #8

Win7 7000 x64

I am having the same exact issue with windows 7 x64 with an nvidia 880GT. I can duplicate the display, but when i try to extend it just flashes the screen. when i hit detect it will even pop up my background for a second, but then it goes away. I tried going from duplicate to extend as well, but it doesn't work.
My System SpecsSystem Spec
12 Jan 2011   #9

Windows 7 Home Premium 64bit

Go to the device manager and update your video adapter. If that dont work go the the manufacture website and get the correct driver
My System SpecsSystem Spec

 External Display won't work

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