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Dual Screen, Windows 7,

Posted on 2009-12-29
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Last Modified: 2013-11-08
Hello

I have a client with a dual screen problem, The graphics card is Nvidia Geforce 9500GT (using the latest drivers), with connect to two screens on via VGA and the other DVI, on random occassions, on hte the screens will not start and just we a black screen, while the other the icons will load but no start bar this is on the other screen.

This does not happen every time, its on a random basic and mainly when you turn the computer off. Restart seems to work fine.

Any Ideas?

Paul
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Question by:PBComputer
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19 Comments
 
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by:Connecter
Connecter earned 500 total points
ID: 26136975
i think the problem is with the display extending
in the drop down list (extend these displays) chose horizontal
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by:tigin44
tigin44 earned 500 total points
ID: 26136984
do the refresh frequencies differ? That may cause the problem..
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by:PBComputer
ID: 26137020
@Connecter when i go to the settinfs all i have is Extend tjere displayes, Diplicates these displays, Show desktop only on 1 and  Show desktop only on 2
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by:PBComputer
ID: 26137022
@tigin44
The refsh rates are 75 Hertz and 60 Herz
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by:Connecter
ID: 26137033
when you restart your computer when both monitors pluged in dose the task manager extends to the other monitor
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by:Connecter
ID: 26137085
here is what to do
make both refresh rates 60Hz
adjust the resolution in both screens to 1280X1024
and keep the dropdown list on extend these displays
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by:SemperWiFi
SemperWiFi earned 500 total points
ID: 26143082
Connecter is correct... attempting to control two monitors at two refresh rates off of one card is simply not going to work. You will have to go with the lesser of the two screen's capabilities. If one will only do 60 then 60 is the number.

The screen resolutions don't matter. As long as the refresh rates are the same you can set each screen to the resolution of your choice within the perspective monitors capabilities.
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by:PCBONEZ
PCBONEZ earned 500 total points
ID: 26144275
ALL LCD screens should be set at 60Hz.
They don't have an electron gun, they don't flicker, and they don't get screen burn.
There is NO reason to set it higher, that will just generate more heat inside and shorten it's life.
60Hz is the industry standard frequency for LCD screens at all resolutions.

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by:PCBONEZ
ID: 26144279
Nvidia Geforce 9500GT is a video -chip-.
Who made the video -card- using that chip?
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by:SemperWiFi
ID: 26144422
I'm not one to publicly correct anyone but so this thread is accurate.

Not all LCD monitors run at 60hz - In fact if you want to use nVidia's 3D glasses they support the latest pure 120 Hz LCDs and DLP® HDTVs.

In most cases, esp this one, the brand name of the card does not matter. nVidia makes the chipsets and in most cases the cards themselves. The brands simply inject their own BIOS which includes their company branding (in most cases this is also done by nVidia). The only exceptions are for OC versions and some specialty cooler assemblies for the most part. This can be seen by peeling the sticker off on most cards to find the default nVidia sticker for that model.

Basics: original equipment manufacturing (OEM) - original design manufacturing (ODM) - original brand manufacturing (OBM)

The companies branding on the fan does not change the ability or driver need of the GPU.
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by:PCBONEZ
ID: 26148171
I'll tell you what.
You go look ate the specifications for the LCD PANELS they use in those screen and you will find the are 60Hz panels.
The 120Hz is emulated in hardware on the circuit board.
- The PANEL is still 60Hz.
.
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by:SemperWiFi
ID: 26149665
PCBONEZ, for the sake of accuracy, please note the above used vernacular -  "run at 60hz"

Try not to be so sensitive friend, we're all just here trying to help people out. Please also note this portion of the discussion does not in any way pertain to the user's issue at hand. We should terminate.
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by:PCBONEZ
ID: 26152010
Those are new to me. - But I stand by what I said.
"For the sake of accuracy:"
ALL LCD screens should be set at 60Hz.
They don't have an electron gun, they don't flicker, and they don't get screen burn.
There is NO reason to set it higher, that will just generate more heat inside and shorten it's life.
60Hz is the industry standard frequency for LCD screens at all resolutions.

If you read how those '120Hz" screens work they are 120Hz by exactly the same thinking that would call a 2.0Ghz Dual Core a 4.0GHz CPU.
The signal is split into two 60Hz signals that are run in parallel to different parts of the screen.
The PANEL is still at 60Hz. Only the signal in the units GPU is at 120Hz.

Additionally, the fact that they can receive 120Hz from a video card does not prevent them from having their refresh lowered to the INDUSTRY STANDARD 60Hz from the 'custom' 'proprietary' 120Hz which has no STANDARD set for it yet.
- At 60Hz they will run cooler and last longer. [That applies to both the panel and the GPU.]
.
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by:SemperWiFi
ID: 26152683
Paul buddy... how is this issue coming? Can you report back a conclusion or update?
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Author Comment

by:PBComputer
ID: 26154634
Sorry bring busy, going back on site to my clients to Saturday morning, will let you know.  The customer is now also thinking of buying a new screen too.  
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by:PBComputer
ID: 26164877
Being back on site, changed the refresh rate and it did the same,, so put a screen from the office in and it not doing it now, tested the old monitor on our systrem and it still does it in a different pc. So sounds like a faulty screen.
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by:Connecter
ID: 26165104
some screens r old and cant handle hi resolution try this resolution on both screens
600X800
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by:PCBONEZ
ID: 26165226
The vast majority of LCD screens these days use cheap Chinese and Thai capacitors.
That certainly applies to both CTX and Iiyama.

Those cheap caps account for probably 80% of LCD screen failures.
The other failures are usually blown transistors or bad soldering but those failures generally have bad capacitors to go along with the other problems.

Often the first indication a screen is on it's way out over caps is intermittent failure to start or it intermittently 'cutting out' during use.

If you know how to solder and how to source the proper grade of low ESR caps most screens can be repaired for under $10.
.
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PBComputer earned 0 total points
ID: 26302147
Turned out to be a faulty screen
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