Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Secondary DVI port not working.

15 Aug 2012   #1

Windows 7 Ultimate x64
Secondary DVI port not working.

I have an HD Radeon 6790 with 2 DVI Port and 1 HDMI port, not sure on the last. Anyway I got a 1920 x 1080 LCD Philips monitor as primary, I got a bigger LCD TV Monitor (Not sure on resolution/inch) I tried to connect it to my secondary DVI port but its not detecting.

Both on my DVI port I use a VGA adapter, so both of the monitor is using VGA connection. The first port works and detects my smaller monitor, but the second port doesn't. My bigger monitor doesn't get detected on any of the DVI ports, not sure of the problem.


VIDEO CARD - 1st DVI port => VGA Adapter => Primary monitor (1920x1080)
VIDEO CARD - 2nd DVI port => VGA Adapter => Secondary LCD TV Monitor (Not Detected*)

I have been trying to find out the issues since the past 4 hours, been searching for answers how to solve this issue but I just had no luck.

- Secondary DVI Port doesn't work
- LG LCD TV cannot be detected on any DVI port

My System SpecsSystem Spec
15 Aug 2012   #2

Windows 7 Ultimate 64bit

Normally, only one of the DVI Ports will pass through the analog VGA signal.
you will need to have one of the monitors hooked up with either an HDMI cable or a DVI cable.
Also note that one of the DVI ports is also shared with the HDMI port, hopefully it's not the one with the analog VGA output.

Give us the model of the LCD TV you are using.
My System SpecsSystem Spec
15 Aug 2012   #3

Windows 7 Ultimate x64

I think you might be right on that, when I was searching online on how to solve this I came across a thread which was talking about not being able to use both ports at the same time so I have to buy an HDMI cable. Oh well I guess I'll try that.
My System SpecsSystem Spec


 Secondary DVI port not working.

Thread Tools

Similar help and support threads
Thread Forum
USB port not working
No USB port of my Dekstop PC is working.These ports can give power to USB device but no data is transferred.So USB mouse,pendrive,tv card etc. cannot work.There is also a little bit connection problem in audio port,Realtek audio port indicator continuously changing with the message-you have just...
Hardware & Devices
My mouse Usb port stops working. but starts working again after a day.
Hello! I'm using my laptop in a desktop mode. but some days when i start up the computer the mouse is on (Sees the red optical light.) But the cursor dont move when i move the mouse. when i drag the cable out and in again the ligh wont turn on. i change usb port and it works. 1-3 days later the...
General Discussion
DVD (not working) not found in Device manager, 1 USB port not working
I have a HP dv6910us Pavilion and the DVD is not listed in Device Manager. DVD Tray opens and light comes on but does not play DVD. 1st USB port on left side gets - USB Device Not Recognized.One under it works and one on the right side works. OS Windows7 Ultimate. It is running kind of screwy so...
Hardware & Devices
USB Port Not Working, Help!
My USB port wont work- If I put in a USB device I just get a message saying "USB device not recognised" . I've tried to uninstall it from the device manager and restart my computer but that doesn't do anything. Help !
Hardware & Devices
one of my usb port is not working
one of my front usb is not working......but the other usb in front and the mic and headphone O/P are working plz help.....whenever i put any hardware their it says unrecognized hardware and show problem code 43............ thanks in advance.....
Hardware & Devices
USB PORT not working
Hello everyone! My uncle recently reprogrammed my computer because it was old and he reprogrammed everything and installed Windows 7. Before the change the usb ports worked fine but now when i plug anything in to the usb ports it's not reading. I've tried going to MY COMPUTER and seeing if the...
Hardware & Devices

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 14:03.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App