3 Monitors only 2 working?

[winder]

i just picked up a third monitor and my PC refuses to use it. I have the asus r9 280x and i am using the HDMI port for my main display. The DVI-D port for the number 2 monitor. and the DVI-I with a vga adapter on the third. When i turn the pc on it will use the HDMI and DVI-D monitors to display the mobo splash screen but after i get into windows it switches over to the HDMI and VGA monitor. Windows detects the third monitor but will only allow me to select the "disconnect this display" option. The AMD control panel dose not even acknowledge the existence of the third "Technically Second acording to windows" monitor. The are all different monitors and resolutions but I wouldnt expect that to be the issue. Does anybody know how to get all three to work. I just want to say i do not want ifinity. I want to use them all seperate.

 

[Shaun o]

That is because the DVI-I port if it states it on your video card is only for an Analogue signal.

If you connected it to the third monitor ect and used a DVI connector on the monitor to connect it.

You have to check the pin out of the cable you use.

Dvi- I ports on a graphics card can output.

A analogue signal only, or a combination of DVI-D digital or DVI-I analog.

So you need to look at the end of the DVI cable and the pin out of it.

If your cable and the pin end of it looking at it has a row of small pins and one large flat pin to one end it is wired for DVI-D digital signalling.

If the end of the DVI cable has a row of pins and then to the left or right a large flat pin with four smaller pins around it.
It is wired for DVI-I signalling Analogue signal output.

You cannot cross a digital output to a receiving device if it requires an analogue signal.
and vice versa.

Or you are left with a blank screen and no image is produced on the monitor.
I suggest you also look at the connector of the monitor if using DVI on it to see if it takes a Digital or analogue type input.

Remember a single flat pin on it denotes a digital input only.
If the Dvi port on the monitor has the flat pin and four pin holes on it, it will accept both digital and analogue signal.

If connecting from a DVI port to a VGA port then you must make sure to use a DVI-I wired cable.
One large flat pin with four smaller pins surrounding it. for Analogue.

If the card has display port connectors in some cases you are required to
buy a active link display cable to use more than two monitors with the card also.

 

[COLGeek]

The problem is the third monitor using an analog signal (the VGA adapter in your DVI-I port).

If only one of the other displays and the one connected via the VGA adapter are in use, do both work?

 

[bignastyid]

With the 280x the 3rd display will need to use a displayport and if the none of the monitors have a displayport then you'll need an active displayport adapter.

 

[winder]

The problem is the third monitor using an analog signal (the VGA adapter in your DVI-I port).

If only one of the other displays and the one connected via the VGA adapter are in use, do both work?

So basically i can only have 3 monitors as long as they are all using digital signals via the HDMI , DVI-D, and display port?

 

[COLGeek]

The problem is the third monitor using an analog signal (the VGA adapter in your DVI-I port).

If only one of the other displays and the one connected via the VGA adapter are in use, do both work?

So basically i can only have 3 monitors as long as they are all using digital signals via the HDMI , DVI-D, and display port?

Yes, exactly. It is a signal timing issue. It requires digital signals on all interfaces to support more than 2 displays. This means using one of the DP (active adapter to use the monitor you have) ports.