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Old 18th June 2010   #1
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LCD monitor won't work with DVI cable


Hi
Just bought a new Samsung 23" LCD monitor.
I connected it to my PC's video card with the digital cable which came with the monitor but the monitor does not 'see' a DVI connection.
When I connect via the VGA cable it works ok.
Is this just a case of a driver needs to be installed?
Do these monitors naturally work with an analogue cable but will only work with a digital cable if the appropriate driver is installed? It would seem strange to me that a Windows driver is required as the output is via my video card (Radeon HD 4350).
I have read the instructions but it doesn't say much.
Thanks

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Old 18th June 2010   #2
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DVI is just a connecting medium, driver will be required only for VGA card like ATI RADEON, NVIDIA. Please revert back with model detail of your samsung monitor and we let you know whether DVI port is available of not. Also, please confirm whether your PC has DVI port?

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Old 18th June 2010   #3
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The monitor is a SAMSUNG P2350.
The video card is a GIGABYTE HD4350 with 512Mb (GV-R4350C-512I).
Both have sockets for Digital DVI-D and Analog VGA. The monitor came complete with both cables.
I have installed drivers for both video card and monitor.

I am a keen MS FlightSim X user and when 'flying' the display occasionally 'binks' which I have never seen before. Any ideas what could be causing that problem?

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Old 18th June 2010   #4
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Originally Posted by jparnold View Post
The monitor is a SAMSUNG P2350.
The video card is a GIGABYTE HD4350 with 512Mb (GV-R4350C-512I).
Both have sockets for Digital DVI-D and Analog VGA. The monitor came complete with both cables.
I have installed drivers for both video card and monitor.

I am a keen MS FlightSim X user and when 'flying' the display occasionally 'binks' which I have never seen before. Any ideas what could be causing that problem?
Things looks fine and i suspect that you have to uninstall the Gigabyte HD4350 Driver and reinstall the same and it should work for you. Please try the same and revert back.

What the amount of RAM you have in your PC and using the task manager try how of RAM is consumed by the MS Flight... application and this should give a fair idea whether to increase it.

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Old 18th June 2010   #5
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Thanks for all your advice.

The PC I am using is one which I have recently acquired and resurrected.
I work for a school and they asked me to dispose of it as iit had been written off due to malfunction.
I took it home to see if there was anything worth salvaging and found that everything worked except the onboard NIC (network interface) so I bought a PCI NIC card and fixed that problem. To my surprise it has a 2.8Mz P4 Hyperthreading socket LGA775 CPU and a PCIE x16 video card slot and also runs DDR400 dual channel ram.
Only problem is that it only has a 250 watt PSU and maybe that is causing some problems so I will upgrade that - do you know what happens when the PSU is 'stretched'? Does that cause a slight drop in voltage?

It currently has 1GB ram (a mixture of DDR400 and DDR333) which I will be removing and replacing with 2 X 512Mb Corsair RAM (and perhaps put the 2 X 256 MB in as well).

This PC I only use as a testing PC and to run FSX. My 'main' PC is a 2.93Mhz Dual Core Pentium with 2 Gb DDR800 ram which I use for video editing.

Would you please answer one more question.
The monitor manual seems to indicate that you can hook it up using BOTH DVI and analogue cables and then use a switch on the monitor to switch between the two.
Is this a good or bad idea (having both cables connected)?
And is it best to set the resolution to what the monitor says is the optimal resolution (1920 X 1080)? I would have thought that the video card has to work harder the higher the resolution.

Thanks again for your assistance.


Last edited by jparnold; 18th June 2010 at 12:06. Reason: add a question
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Old 18th June 2010   #6
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Originally Posted by jparnold View Post
Only problem is that it only has a 250 watt PSU and maybe that is causing some problems so I will upgrade that - do you know what happens when the PSU is 'stretched'? Does that cause a slight drop in voltage?
It can cause hanging or rebooting.

Quote:
Is this a good or bad idea (having both cables connected)?
If your monitor has a switch, I think 2 cables should not be a problem. The problem arises only when the monitor auto switches between the signals & ends up displaying a blank screen if both inputs are used.


Quote:
And is it best to set the resolution to what the monitor says is the optimal resolution (1920 X 1080)? I would have thought that the video card has to work harder the higher the resolution.
Every LCD monitor has a native resolution on which it works best. You should stick to that resolution if your card supports it.

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Old 19th June 2010   #7
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Hi jparnold, your videocard HD4350 is not high spec videocard but at the same time go to the ATI website and download the newer drivers there for that card including the ATI control centre and install that. A PSU of 250 Watt is at the very low end and in the setup that you have I would be looking at a 350 W PSU.
There have been issues reported about the Native Resolution on this model 23" Samsung the native resolution on this monitor according to Samsung is 2048 x 1156 which is a somewhat strange resolution and most seem to get only 1920 x1080 resolution.
Once you have installed the ATI control centre it will give you all the available resolutions also you can in many instances set a resolution and try the "Force Resolution" it will not always work though.
I have also multi connection on my Monitor VGA, DVI and HDMI, but it is recomended to use only only one at a time as the monitor can become confused.
Get information and drivers from here:

http://www.amd.com/us/products/deskt...-overview.aspx

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Old 19th June 2010   #8
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Thanks for your reply and info.

Yes I realise that the video card is not a high spec videocard but then again the fastest video output that I require is for Flight Sim X and I didn't want tp spend a fortune.

The data which came with the monitor says that the native resolution is 1920 X 1080. When I bought the Samsung (only yesterday) I was considering an ACER and also a BENQ but after much 'googling' and the advise of the salesperson I stelled for the Samsung. Also because I have a Samsung on my other PC and I have read that for LCD TV's the top brands are Sony, Panasonic and Samsung.
So it was an 'educated' decision to purchase the Samsung.

Not long ago I hooked the monitor up to a different PC with a DVI (digital) cable and it WORKED!
It now seems that it is either a driver issue or there is a fault with the video card. I will try your suggestion and download the latest driver and the ATI control centre although I am wondering how a driver and/or 'contro clentre' could affect whther or not the DVI output was on or not - I would have thought that all video cards would output to BOTH the analogue and digital ports. What do you think?

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Old 19th June 2010   #9
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The issue seems to be with the card. Driver has no role to play.

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Old 21st June 2010   #10
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Yup, have to agree with rsinfo here.

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Old 21st June 2010   #11
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Before going any further please note that the PC in question is NOT the one which is in my profile. This is a PC which I 'rescued' after being thrown out by a school as not working. I was going to salvage parts but found that it worked apart from the onboard LAN.
I thought that readers might think I am referring to the PC as described in my 'profile'

Now -

Since my original post I found that once (yes only once) the monitor worked using the DVI cable.
I am well aware that the PSU for the PC is lower than it should be. The original PC used onboard VIDEO, LAN and SOUND and only had a 250watt PSU and appeared to operate ok. That was before it came into my possession.
Since I acquired it I added a sound card (to obtain the gameport only), a LAN card (the onboard LAN didn't work) and a PCIe 16x 512Mb video card. The dox with the video card suggests a minimum 400 watt PSU.
I have NOT yet upgraded the PSU.

Because the heat sink on both the video card and the 915G Express Chipset get very warm even though the heat sink on the video card has a fan.
I am thinking that this is possibly because the power supply is over stressed - am I thinking correctly? Would they get warmer than normal if the supply voltage is low?

Also when using the DVI cable the (motherboard) POST messages appear but once Windows starts to load nothing is displayed maybe because by that time the power supply has warmed up and started to become overloaded.
Strange though that everything displays correctly when using the analogue cable.
Hey I just remembered that (with TV sets ) if digital signals are low then you may not get a display whereas if analogue siganls are low then the picture will display but with an inferior image - Arie, am I on the right 'track'.

I intend to see if there is an improvement using a 300 watt PSU (I have a spare one which is too big for the desktop case but will try it and see what happens and then consider purchasing a new case with 400watt+ PSU).

I look forward to your expert opinion(s)

Thanks again everyone for your replies.

I hope that I never stop learning.


Last edited by jparnold; 21st June 2010 at 12:16. Reason: added text
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Old 22nd June 2010   #12
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I doubt its a PSU problem, because the monitor works with the VGA cable. Most likely the DVI port on the graphics card is shot.

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Old 22nd June 2010   #13
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But even so, I would upgrade your PSU as it is indeed very tight.

EDIT: Do you have another DVI monitor to test it with?

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Old 22nd June 2010   #14
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Here is the graphics manual:
ftp://download.gigabyte.ru/manual/vg...%29-512i_e.pdf

Quote:
Minimum System Requirements
....
A power supply that provides at least 400-watt is required....
(and they suggest a quality, not a low-priced generic).

There are some suggestions about switching between VGA and Digital in the monitor's manual. For example, it looks like you should turn off the computer and probably the monitor, before changing to DVI. Does it have a message on the screen?

I have had some PC cases where the DVI connector could not be bolted in all the way because of the case design.

You won't know if it works or not unless you provide (more than) the minimum requirements for the graphics adapter.

Matt

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Old 22nd June 2010   #15
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Thanks for everyone's input.

The is now seems to be working ok with the PC and video card for some strange reason.

The monitor has a push button switch to change the input from analogue to digital (and back).

I will be purchasing a new case and PSU as the existing case is a very small desktop case and won't allow a larger PSU and besides I prefer to have a tower case than desktop.

I think that I will now close this thread.

BUT I will also leave one more question.

The manual suggests that the CPU be a MINIMUM or Dual or Quad core Pentium.
Does anyone know what could be expected if the CPU was 'lower'.
I have a P4 2.8Mhz socket 775 Hyperthreading (the precursor to to the Dual core)


Thanks again


Last edited by jparnold; 22nd June 2010 at 21:58. Reason: Add text
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