Setting up a second monitor

  • Thread starter Thread starter Metspitzer
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Metspitzer

I was using an old VGA monitor as primary (VGA connector). I was
using an LCD monitor for a second monitor (DVI). It worked fine.

I replaced the VGA monitor with another LCD monitor using a HDMI.

When I try to extend the second monitor nothing happens. The existing
LCD monitor will not work. When I go back to the settings the setup
can see the second monitor but the "extend" check box is unchecked.

I have an ASUS M4A79XTD EVO mobo.
 
I was using an old VGA monitor as primary (VGA connector). I was
using an LCD monitor for a second monitor (DVI). It worked fine.

I replaced the VGA monitor with another LCD monitor using a HDMI.

When I try to extend the second monitor nothing happens. The existing
LCD monitor will not work. When I go back to the settings the setup
can see the second monitor but the "extend" check box is unchecked.

I have an ASUS M4A79XTD EVO mobo.
Click to expand...

BTW I just tried starting the computer with the DVI monitor plugged
in only. It works. When I plug in the HDMI it becomes the primary
display and the other monitor goes blank.
 
I was using an old VGA monitor as primary (VGA connector). I was
using an LCD monitor for a second monitor (DVI). It worked fine.

I replaced the VGA monitor with another LCD monitor using a HDMI.

When I try to extend the second monitor nothing happens. The existing
LCD monitor will not work. When I go back to the settings the setup
can see the second monitor but the "extend" check box is unchecked.

I have an ASUS M4A79XTD EVO mobo.
Click to expand...

Since everything else failed.........I read the instructions. It says
HDMI + DVI not supported.
Never mind
 
I was using an old VGA monitor as primary (VGA connector). I was
using an LCD monitor for a second monitor (DVI). It worked fine.

I replaced the VGA monitor with another LCD monitor using a HDMI.

When I try to extend the second monitor nothing happens. The existing
LCD monitor will not work. When I go back to the settings the setup
can see the second monitor but the "extend" check box is unchecked.

I have an ASUS M4A79XTD EVO mobo.
Click to expand...

I don't use HDMI (Digital MANAGEMENT hasn't yet set well with me for
purposes I haven't largely encountered need to meet). If you ran two
without issue through VGA & DVI, that may be indicative of all that
the videoboard is capable, that it's a matter of ensuring the adapters
(when using two known and working ports) are providing correct
signaling. Beyond which, you'll have to hunt down the ports you're
attempting for what issues are at stake, at what pin signals, possibly
inclusive of encoded protocol "package" timings, in order to determine
compliance and if at all that's possible within means you may be
attempting to circumvent, given forethought for the Hollywood scheme
of progressive computer standards.
 
Since everything else failed.........I read the instructions. It says
HDMI + DVI not supported.
Never mind
Click to expand...
I think your problem is that HDMI and DVI are the same
video. HDMI adds audio to the cable.
 
Metspitzer said:
Since everything else failed.........I read the instructions. It says
HDMI + DVI not supported.
Never mind
Click to expand...

"HDMI + DVI not supported."

Bingo.

Some of these chips, they only have one digital output. And you
can either use DVI or HDMI, but not both at the same time.

That has also happened on a couple models of sub-$50 video cards.
The cards have multiple connectors on the faceplate, but a
couple of them can't be used at the same time. You have to
read the customer reviews on Newegg, for confirmation of
such design stupidity. The product description may
conveniently forget to mention it. Either the GPUs were
rejects, or they were doing cost saving, by not adding a
TMDS transmitter to make another independent interface.

Some GPUS, they have auxiliary digital busses for output. When
you want a particular flavor of connector for the video card
faceplate, you add a chip. So you might add a "TV chip", to go
from digital bus to Composite or S-video. Or a "VGA chip", to
convert from the digital bus to VGA. Or a "TMDS transmitter"
to make a separate HDMI or DVI. Such a scheme adds flexibility,
but at the price of having to add chips to the design.

As for the folks at Asus, they haven't always been the best
at addressing this in the user manual. Many of the early
multiple output motherboards, made no mention of any
restrictions. The users had to figure it out.

Paul
 
I was using an old VGA monitor as primary (VGA connector). I was
using an LCD monitor for a second monitor (DVI). It worked fine.

I replaced the VGA monitor with another LCD monitor using a HDMI.

When I try to extend the second monitor nothing happens. The existing
LCD monitor will not work. When I go back to the settings the setup
can see the second monitor but the "extend" check box is unchecked.

I have an ASUS M4A79XTD EVO mobo.
Click to expand...

And what happens when you check it?
 
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