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  HD 6850 need help please! 
 
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Ddanz Apr 11, 2012, 09:29pm EDT Reply - Quote - Report Abuse
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Hi, I recently purchased a HD6850 and it seems as if the 2nd DVI port is not working, because no display shows on my 2nd monitor. I've already tried connecting my 2nd monitor to the first DVI port and it works fine, just the 2nd port doesn't seem to be working.. is it a setting I need to change in Catalyst or just a defective port? Many thanks in advance!


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Ddanz Apr 12, 2012, 01:59pm EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
Really? 100 views and nothing? :(

Meats_Of_Evil Apr 13, 2012, 12:17pm EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
I have no experience with Ati cards but check the catalyst control panel to see the options for multiple monitors. I would also suggest for you to try both DVI ports on the video cad with your primary monitor just out if one is faulty or not, If indeed one is faulty then I 'd suggest that you RMA your card or return it to the store in which you bought it and get a new one.

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Everything I write is Sarcasm.
Michael C Apr 13, 2012, 03:10pm EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
There should be no settings you need to change in the CCC. It sounds like something with the card, monitor or cable. Did you try to ensure they both work?

Ddanz Apr 14, 2012, 03:21am EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
Michael C said:
There should be no settings you need to change in the CCC. It sounds like something with the card, monitor or cable. Did you try to ensure they both work?


Yeah I've tried my 2nd monitor on the first DVI worked fine.. then tried my first monitor on the second DVI and it didn't work, both monitors work fine on the first DVI but on the 2nd DVI none of my monitors work.

john albrich Apr 14, 2012, 07:25am EDT Reply - Quote - Report Abuse
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Edited: Apr 15, 2012, 02:07am EDT

 
>> Re: HD 6850 need help please!
.
It's not 100% clear whether your tests were run with TWO monitors connected to both DVI ports at the same time, or whether your specific card even supports that configuration.

IF two simultaneous displays on the two DVI ports is what you are expecting to work, then as was said above, you need to check what video configurations your cards supports...but check the specifications in the user manual (the online product pages or sales pages almost NEVER state such limitations).

Cards sometimes disallow using both DVI ports on two separate displays at the same time, or using specific combinations of two ports at the same time (e.g. a card might support (DVI-D)+vga or HDMI+vga, but not HDMI+(DVI-D), etc). And, one manufacturer's model implementation may differ from another manufacturer's implementation (e.g. a Gigabyte XYZ card might support a specific config where a Sapphire XYZ card won't (or vice-versa). Again, the limitations are adapter-specific.

Also, the maximum supported resolution on a given connector can change depending on the display connection configuration, and that too will depend on the adapter specs.


edit:
added DVI "-" suffixes to examples to further show in example that one might still be able in combination with another connector, to use the analog portion of a DVI-I connector even if you can't use the digital portion due to the video card's limitations. Of course, with a DVI-D only connector one doesn't have that flexibility. One can also be surprised that a given adapter may only provide a DVI-D connector instead of a DVI-I connector. A DVI to VGA adapter will not work on a DVI-D connector (there is no analog signal available to "adapt").

Ddanz Apr 18, 2012, 03:54pm EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
Here is my card http://www.newegg.com/Product/Product.aspx?Item=N82E16814131374
Ok so here is what I have tried so far...
1. Plug in both my monitors to both the DVI's - Did not work*
2. Thinking it might be my monitor I've tried both monitors on both DVI's one at a time, only one of the DVI port worked.
3. Lowered my resolution - Did not work*
4. Tried 1 DVI and 1 HDMI - DId not work*

At this point, I am just thinking about sending the card back and getting a replacement one, cause both DVI's should work right off the bat when connected. Any last suggestions before I send it back?

Meats_Of_Evil Apr 19, 2012, 02:19am EDT Reply - Quote - Report Abuse
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Edited: Apr 19, 2012, 02:20am EDT

 
>> Re: HD 6850 need help please!
Sending it back was my initial suggestion. When hardware seems unresponsive there's very little to do and you're better of getting an RMA for the product.

Also, post back if you do RMA it and works.

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john albrich Apr 19, 2012, 05:05am EDT Reply - Quote - Report Abuse
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Edited: Apr 19, 2012, 05:09am EDT

 
>> Re: HD 6850 need help please!
.
I agree. If you've ruled out the displays, cables, adapter plugs, drivers, configuration setup, etc. then the only thing left is the card itself.

But, there are a couple more configuration details to keep in mind that could cause the symptoms you describe. Again, it's the hardware configuration details that matter.

Just to cover all the bases...

Many people don't realize there are different kinds of DVI connectors, and I know that has historically caused some people to blame a video card when it was really because they didn't understand the limitations of such DVI-x connector differences. I'm only including this because we don't have the nitty-gritty details of your hardware configuration. We might ASSUME you are using only a straight DVI-D to DVI-D cable connection to the DVI connector on the display, but that has that awful word "assume" in it. For example, one can NOT use a DVI-to-VGA or DVI-to-Component adapter on the 6850's DVI-D connector, as the DVI-D connector does not provide any analog signals. So IF one is using such an adapter anywhere between the DVI-D connector and the display, then that could be one reason the display won't work on one of the DVI ports as you reported ("...only one of the DVI port worked"). However, that same hardware (display, adapter, cable) would work on the DVI-I connector, because DVI-I does provide analog video signals. I'm not saying that's the case here, but we don't know whether you are using any adapters or cables with built-in adapter function (e.g. a DVI-to-VGA or DVI-to-Component video cable). One must make sure the specific cables (and specific adapters, if any) are all compatible with the specific outputs and the specific inputs, that the card supports the hardware display configuration, and that the card drivers support the configuration as well.


Just FYI...regarding multiple display connection limitations I discussed earlier...keep in mind limitations do exist.

Since the multiple display issue intrigued me I also took time to find and examine the user manual for the PowerColor 6800 series. As best I can tell, what you've been doing should work. Certainly the one-at-a-time display checks you tried in your last post should have worked (assuming the proper connection hardware was used as discussed above).

In addition, the manual says you can have displays attached to any TWO of the three connectors consisting of the two DVI's and the HDMI (the display port is treated differently). So, DVI+DVI is ok, or DVI+HDMI is ok, but DVI+DVI+HDMI isn't supported.

Note: there also can be different bandwidth restrictions (which can affect resolutions) since one of the DVI's is single-link digital only and the other is dual-link...but from what you've written that also doesn't seem to be the issue. So a long as you're abiding by the limitations of the hardware connections, and have the software set up correctly, it should be functional.

http://www.power-color.com/Manual/090106/Radeon_HD_6800_Series_ENG.pdf
Starting around page 12...
"Two connections between the single-link DVI-D, dual-link DVI-I, and HDMI connections."

Ddanz Apr 19, 2012, 01:24pm EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
john albrich said:
.

Many people don't realize there are different kinds of DVI connectors, and I know that has historically caused some people to blame a video card when it was really because they didn't understand the limitations of such DVI-x connector differences. I'm only including this because we don't have the nitty-gritty details of your hardware configuration. We might ASSUME you are using only a straight DVI-D to DVI-D cable connection to the DVI connector on the display, but that has that awful word "assume" in it. For example, one can NOT use a DVI-to-VGA or DVI-to-Component adapter on the 6850's DVI-D connector, as the DVI-D connector does not provide any analog signals. So IF one is using such an adapter anywhere between the DVI-D connector and the display, then that could be one reason the display won't work on one of the DVI ports as you reported ("...only one of the DVI port worked"). However, that same hardware (display, adapter, cable) would work on the DVI-I connector, because DVI-I does provide analog video signals. I'm not saying that's the case here, but we don't know whether you are using any adapters or cables with built-in adapter function (e.g. a DVI-to-VGA or DVI-to-Component video cable). One must make sure the specific cables (and specific adapters, if any) are all compatible with the specific outputs and the specific inputs, that the card supports the hardware display configuration, and that the card drivers support the configuration as well.


I apologize I have failed to mention that both of my monitors are using VGA cables with an DVI adapter. But 1 of my newer monitor has a DVI port on the monitor itself so I will try and direct DVI cable, but as for the other monitor I have no choice but to use the VGA to DVI adapter. I will try this and post back. Once again I thank you guys for all your support. :)

Ddanz Apr 23, 2012, 07:20pm EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
So here is an update, I purchased a DVI cable and plugged it in with a DVI and the 2nd monitor with an VGA to DVI adapter and now both of my monitors are working! Thanks again guys! :)

john albrich Apr 23, 2012, 07:50pm EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
.
BTW, apologies not needed. It's all part of the learning experience and part of why HWA is here.


Glad it fixed your problem.


For more info on DVI connectivity, see
http://en.wikipedia.org/wiki/Digital_Visual_Interface

Some Cautions! Something many articles on video connectors don't address...
It should be noted that quick visual examination of a female DVI connector can be misleading.

For example, some manufacturers use connectors that look like a complete DVI-I dual-link connector, but in fact, the underlying wiring or circuitry may not be there. The circuitry/wiring may in fact support only DVI-D single-link or even DVI-A connectivity. However, using a DVI-I dual-link appearing connector on a video card actually increases flexibility in cable choices and can be a Good Thing in that you may be able to use a cable you have already and not buy another cable, but it can also make it more confusing for the end-user.

Even more tricky...
A female connector may have holes there that mate with the male connector pins, but if you look very closely at the holes you may see that there is no metal receptor in some of them. And, even if there are metal receptors in some or all of the holes, that doesn't necessarily mean all of the receptors are actually connected to wiring in the circuit board (or the cable) itself.

Of course the easiest way to verify an video card or cable's connectivity is by the specifications on its box. Sometimes the information is printed on the connector or the cable itself. But sometimes, the only way to find out if an unlabeled, unspec'd connector/adapter/cable/video-card has the connectivity you need, is to either test it in a known configuration, or if you have the equipment...with an ohm-meter, DMM, continuity tester, or cable tester.

HDMI was supposed to save us from all this confusion, but as always...there are now multiple versions of HDMI, HDMI connectors, and HDMI cables...and HDMI connectivity is now causing similar problems in the marketplace. HDMI standard-speed v. high-speed, HDMI with/without USB, HDMI with/without ethernet, etc. I'm convinced that a LOT of devices that people believe are "bad" simply aren't working right because they don't understand the connectivity requirements, or are mislead by simply visually inspecting the connectors and making assumptions about what a connector does or does not support.

Ddanz Apr 24, 2012, 01:50pm EDT Reply - Quote - Report Abuse
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>> Re: HD 6850 need help please!
john albrich said:
.
BTW, apologies not needed. It's all part of the learning experience and part of why HWA is here.


Glad it fixed your problem.


For more info on DVI connectivity, see
http://en.wikipedia.org/wiki/Digital_Visual_Interface

Some Cautions! Something many articles on video connectors don't address...
It should be noted that quick visual examination of a female DVI connector can be misleading.

For example, some manufacturers use connectors that look like a complete DVI-I dual-link connector, but in fact, the underlying wiring or circuitry may not be there. The circuitry/wiring may in fact support only DVI-D single-link or even DVI-A connectivity. However, using a DVI-I dual-link appearing connector on a video card actually increases flexibility in cable choices and can be a Good Thing in that you may be able to use a cable you have already and not buy another cable, but it can also make it more confusing for the end-user.

Even more tricky...
A female connector may have holes there that mate with the male connector pins, but if you look very closely at the holes you may see that there is no metal receptor in some of them. And, even if there are metal receptors in some or all of the holes, that doesn't necessarily mean all of the receptors are actually connected to wiring in the circuit board (or the cable) itself.

Of course the easiest way to verify an video card or cable's connectivity is by the specifications on its box. Sometimes the information is printed on the connector or the cable itself. But sometimes, the only way to find out if an unlabeled, unspec'd connector/adapter/cable/video-card has the connectivity you need, is to either test it in a known configuration, or if you have the equipment...with an ohm-meter, DMM, continuity tester, or cable tester.

HDMI was supposed to save us from all this confusion, but as always...there are now multiple versions of HDMI, HDMI connectors, and HDMI cables...and HDMI connectivity is now causing similar problems in the marketplace. HDMI standard-speed v. high-speed, HDMI with/without USB, HDMI with/without ethernet, etc. I'm convinced that a LOT of devices that people believe are "bad" simply aren't working right because they don't understand the connectivity requirements, or are mislead by simply visually inspecting the connectors and making assumptions about what a connector does or does not support.



Haha thanks!


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