Trying to setup dual monitors

[Gregrs]

Found a spare monitor, I plugged it in and it said that it needed input basically. So I'm trying to setup a second monitor, and it basically does nothing. The other screen is black. My computer recognizes that there is a second monitor, but whenever I try to extend the displays, it's just like "nah, you can't cant do that"

 

 

[Pesukarhu]

What are you connecting the monitors with? Have you tried win+p shortcut?

[danomicar]

Sounds like you haven't plugged the other monitor into your video card

[Gregrs]

The monitor is connected with VGA, but I don't have VGA on my computer, so I'm using a VGA to DVI converter as well.

[ExozeGD]

try change the dvi port since some doesn't have support for vga

[Gregrs]

Okay, when the monitor is just plugged in, not connected to the computer, I get this on the screen.

 

But the second I plug the vga cable into my computer, it just goes black and doesn't do anything

[Gregrs]

Also, after I plug theVGA cable in, the green light (showing that it has power) starts blinking. But when the cable isn't in, the light is just on all the time.

 

@ExozeGD I already tried that, the screen was still black. I've even tried using only the second monitor, it just doesn't do anything.

[Pesukarhu]

Try connecting both screens and rebooting. If you have a working connection bios will show up on both monitors.

[Gregrs]

1 hour ago, Pesukarhu said:

Try connecting both screens and rebooting. If you have a working connection bios will show up on both monitors.

I tried that too. The screen only appeared on my main monitor, not my secondary one.

[Pesukarhu]

1 minute ago, Gregrs said:

I tried that too. The screen only appeared on my main monitor, not my secondary one.

Can you test the second monitor and cable on something else and see if it works?

[Gregrs]

1 hour ago, Pesukarhu said:

Can you test the second monitor and cable on something else and see if it works?

 

I'll get my PS2 and see if the monitor works with that.

[Gregrs]

Okay, so I got my brothers laptop and plugged it in, the display showed up. So I'm assuming it's a problem with the adapter...?

[Pesukarhu]

1 minute ago, Gregrs said:

Okay, so I got my brothers laptop and plugged it in, the display showed up. So I'm assuming it's a problem with the adapter...?

 

Could be the adapter or your gpu. Are you sure you plugged it in a dvi-i port?

[Gregrs]

I tried both ports, and it didn't work. 

 

I have the XFX Radeon HD 7870 GHz Edition GPU

 

And this is the adapter I have

[Gregrs]

Okay, I got it to work, but the problem is, when I'm using my main monitor and I hit (extend these displays) it makes the secondary monitor my main one, and my main one gets underscanned and is used like a secondary.

 

How do I fix this?

[Pesukarhu]

In windows display settings you can select the main screen with a little checkbox. In win10 it is hidden in advanced settings. Underscan can be changed in the advanced radeon settings.