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Can't get vga switch to work two monitors - Computers & Internet

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Do have a motherboard that supports this?

Posted on May 15, 2010

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What is the best way to connect 2 computers to this monitor


If you have two separate computers for different purposes, such as personal and work use, you may find it convenient and necessary to connect both to a single monitor. Many monitors have dual inputs, making such a connection simple. However, you might need a keyboard, video and monitor switch to accomplish this task if the monitor lacks a second input. Dual Inputs
Step 1 Examine the back of your monitor for the presence of dual video inputs, such as a single VGA and DVI or HDMI output.
Step 2 Connect the VGA cable to one computer. Plug the other end of the cable to the matching input on the monitor. Rotate the retaining screws until tight at both ends of the cable.
Step 3 Plug the DVI or HDMI cable into the back of the second computer. Insert the other end into the monitor's digital video input. Screw down the retaining screws if you're using DVI.
Using a KVM Switch
Step 1 Ensure both computers are turned off. Place the KVM switch on your desk where it is within convenient reach.
Step 2 Locate the video output port on the back of the KVM switch. Plug a VGA cable into this port. Plug the other end of the VGA cable into the monitor.
Step 3 Plug the VGA monitor outputs from each computer into the inputs on the back of the KVM switch. Tighten the retaining screws down for each connected VGA cable on the computers and the KVM switch.
Step 4 Plug the keyboard and mouse cables into their respective outputs on the KVM switch. Plug each set of keyboard and mouse cables from their ports on each computer into the matching inputs on the KVM switch. Plug each cable in sequentially to avoid mixing them up between machines.
Step 5 Double-check that the mouse, keyboard and monitor cables leading from each computer all correspond to the right machine. Plug the KVM switch's power cord into a nearby AC outlet or power strip.
Step 6 Turn the computers and monitor on to verify the connections are correct.

Required Items

  • VGA cable
  • DVI or HDMI cable
  • KVM switch
  • Power strip (optional)

Jun 13, 2014 | Acer 22" X223w LCD Monitor

1 Answer

My acer monitor H243H says No Signal after I unplugged the DVI cable and plugged it back in. I can't switch the input because nothing happens when I push the input button on the bottom of the monitor. It...


Maybe your BIOS switched to VGA output, try plugging in another monitor which has VGA input and change settings in BIOS for default output to DVI.

Nov 05, 2013 | Acer H243H Monitor

1 Answer

Trying to set up 3 monitors in windows 7. using on board dvi to connect to one monitor and on board vga to connect to switch box (which then splits video signal to two vga monitors). can only get the dvi...


Sometimes it is difficult to answer a question without asking very basic questions. Using a DVI and a VGA ports will allow you to have screens with different things showing on them. If you use a splitter, the two monitors connected to the splitter will show the same thing on both screens. Is this what you want? I use a splitter at church to have Powerpoint on the main computer monitor, the program then shows on the screen on the wall and the TV monitor, as well as the second monitor at the computer. My splitter occasionally acts up, and I found that unplugging it and plugging it back in makes it work for another couple months. But a splitter for only two monitors is very cheap, no switch box involved.

Oct 01, 2017 | StarTech.com VideoView ST124 (65030772815)...

1 Answer

When I turn on my HP Pavilion 1x1000 It stays on ,but there is no image on the screen, and stays on please help.


A) Post THE Product Number on the bottom of the laptop. It's in the white Service Tag. P/N = Product Number.

B) On the left/bottom side of the LCD screen frame (Display Bezel), there is a switch. Looks like a small button.

This is the Internal Display Switch. (May not be in this exact position for your model. Look around on the Display Bezel, that surrounds the LCD screen)

When the laptop is closed, the switch turns off the display, (Image on screen), with the computer still on.
Tap it a couple of times lightly, with the eraser on the end of a number 2 pencil.

See if anything happens. That switch may be bad.

C) Laptop off, monitor off, connect a VGA monitor to the VGA port on the laptop.

Example of a VGA cable, and VGA connector, (Port),

http://en.wikipedia.org/wiki/VGA_connector

You can use a CRT monitor, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

C) Turn the monitor on. If a CRT type of monitor allow it to warm up.
Turn the laptop on.

By factory default settings, the display should show on the external VGA monitor.

IF not;
There are at least 3 display options,

1) Internal monitor of laptop ONLY
2) Internal monitor AND external VGA monitor
3) External VGA monitor ONLY

Press, and hold down on the Fn key. At the same time tap once on the Display Toggle-Over key.

Don't know what exact HP laptop you have. For most HP's it is the F2 key, or the F4 key, that is the Display Toggle-Over key.
(Key has an empty rectangle on it, with a vertical line on each side)

Still no display on the external VGA monitor?
Hold the Fn key down again. (Bottom left of Keyboard)
Tap once more on the Display Toggle-Over key

NO display on the external VGA monitor, means you have a bad graphics chipset.

(By using an external VGA monitor, you are bypassing the Internal Display Switch, and the Display Assembly. (Internal monitor of laptop)

If you have a display on the external VGA monitor, you have a problem with;

1) Video Cable, (Display Panel Cable for HP)
or
2) Display Assembly

Post back with your results, and if you have a display on the external VGA monitor, we will go on.

If you do not have a display on the external VGA monitor, you are looking at motherboard replacement.

Post back in a Comment.

Regards,
joecoolvette


May 13, 2012 | HP Computers & Internet

1 Answer

Just received Refurbished Advent CBE 1401. It is being replaced because power switch is faulty - but I have questions about machine. 1. When initially switched on the switch turned red is this normal? I...


1) No. The switch color should have been Green

2) No Signal on the monitor, indicates the monitor is not receiving a Video Signal from the computer.

A) Could be due to a faulty monitor cable.
Monitor cable is used on a working computer for a test,
Or,
working computer's monitor cable is used on the Advent for a test.

B) Could be due to the graphics 'engine' on the motherboard, or on the graphics card is bad.

[Graphics 'engine'.
GPU
Graphics Processing Unit.

http://en.wikipedia.org/wiki/GPU ]

If the computer is using Integrated Graphics, the GPU is on the motherboard.

(Integrated Graphics is also referred to as OnBoard Graphics. Meaning On the motherBoard)

You will know if it's Integrated Graphics, because the monitor cable will be plugged into the VGA connector, on the motherboard

http://en.wikipedia.org/wiki/VGA_connector

Since you indicate an adapter was included, to adapt to a different port (Connector), it could be a VGA to DVI adapter, or a DVI to VGA adapter.

Your monitor may just have a VGA connector on the monitor cable.
Hence you would use a female VGA to Male DVI adapter.

Your monitor may be an LCD flat screen monitor, and has a DVI connector on the monitor cable.
Hence you would use a female DVI to Male VGA adapter.

DVI
Digital Visual Interface

http://en.wikipedia.org/wiki/Digital_Visual_Interface

VGA monitors are Analog.
LCD monitors are Digital.

A computer puts out a digital signal.

If a VGA monitor is used, the computer has to alter the Digital signal to an Analog one.
This slows down the video signal.

If your monitor (In any case. Not just this one), is an LCD flat screen monitor, it is best to use a DVI monitor cable, and plug into a DVI port on the computer, if available.

If your monitor is a VGA (CRT. Cathode Ray Tube), monitor, and you have a DVI connection on your computer, using the adapter will do you no good.

The adapter just uses the contact pins for VGA, that are present in that DVI adapter, and hence the DVI connection on the computer.

You're still just getting an Analog VGA signal.

Example of a female VGA to male DVI adapter,

http://www.directron.com/dvi.html

If the Integrated Graphics are suspected to be bad, a graphics card is used in the appropriate expansion slot, for a test.

If the graphics work then, the graphics card is left in service.

After I test the monitor cable my next procedure is to suspect the Power On switch, or the Power Supply, and go to the graphics next.

The reasoning is that Power Supply failure, is the number one cause of computer failure.
The next is the Power On switch, then Electrolytic Capacitors used on the motherboard.

(Specifically, any Electrolytic Capacitors used in the motherboard Voltage Regulator Circuit)

If the Power On switch is bypassed, the diagnosis will reveal if the problem is the switch, or Power Supply.

Bypass the Power On switch, and the Power Supply comes on?
Problem is the Power On switch.

[One Power On switch I have found to fit a lot of computers. The Power On switch goes into the plastic Power On button,

http://www.directron.com/atxswitch.html ]

Bypass the Power On switch, and the Power Supply does Not come on?
The problem is the Power Supply.

The Power On switch is bypassed using a jumper wire, from the green Soft Power On wire, to ANY black Ground wire. The contact made is a brief momentary one.

The jumper wire is used at the back, of the 20, or 24-pin ATX main power cable connector.

To be continued in an additional Comment.


Jun 04, 2010 | Computers & Internet

1 Answer

Nothing came on monitor after switch on, all 4


Can you supply any more information?

All I can suggest with the information provided is to check that the monitor is plugged in and switched on and that the monitor is plugged into the computer with a VGA cable (try to avoid using a VGA-DVI cable adapter until you know everything works).

Jul 02, 2009 | Dell OptiPlex GX280 PC Desktop

2 Answers

Monitor says No signal digital


Is ether the monitor or video card uses both DVI or VGA port. There may be a switch on the graphic card that changes it from DVI to VGA, often outside the card.

Also is the computer monitor set to the right setting if it can use both VGA and DVI, if using DVI (of any type) it need to switch to digital, and if using VGA it need to be set to analog. This may be a physical switch or using the settings button. (see manual how to change them)


PS: VGA port is a blue D shaped port with 15 pin holes, and DVI is a white rectangle port with one port being a line.

Mar 17, 2009 | ViewSonic VG2030wm LCD Monitor

3 Answers

Getting my samtron to work on my cctv


Not all DVRs have WORKING VGA output. I used to work for Nuvico, and we had 2 different versions for DVRs. Ones with VGA connection. The other with non-working VGA connection. VGA port itself does not guarantee. Some DVRs also have DIP switch in the back. You can simply toggle between composite or VGA output. Ones with DIP switches often require reboot, and from my experience these do not work well with VGA monitors. Also... Make sure VGA monitor support low resolution. Stand-alone DVRs' native resolution is either 600 or 800 horizontal lines.
It will help alot if I know the model of DVR/CCTV

Jan 17, 2009 | SAMTRON 95P 19" CRT Monitor

1 Answer

Hyundai monitor connects two computers .how do i switch between them?


Use a KVM (keyboard,video, mouse) switch to connect your 2 computers to this monitor. Then you can also have only one keyboard and one mouse. Connecting to the VGA header with one computer and the digital with another is probably not a good idea and the only way that can work is if your monitor has a built in video switch that can be controlled with software. If that is the case they would boast about it in the user manual and tell you how to activate the switch. VGA KVM switches are relatively in-expensive. Some high end KVM switches will exceed the cost of your monitor.

Jan 18, 2008 | Hyundai L90D+ 19" LCD Monitor

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