MacPro - Dual monitors - to link to older CRT 4:3 monitor / tv

Hi
I didn't know where to post this, so hopefully I've come to the right place.
I have a 2008 Mac Pro, and dual DVI monitors. I have lots of older VHS tapes I want to edit and want to preview the edits on an older CRT monitor / tv I have lying around at home. It has a scart and RCA connections on it. I also have a canopus advc 300 which I use to transfer video through to my mac.
Is there any way I can link the old monitor for previewing clips as my existing computer monitors are widescreen.
Thanks in advance.
Matt

This is how I have it thus far:
/etc/X11/xorg.conf.d/10-monitor.conf
Section "ServerLayout"
Identifier "DualSreen"
Screen 0 "Screen0"
Screen 1 "Screen1" RightOf "Screen0" #Screen1 at the right of Screen0
Option "Xinerama" "1" #To move windows between screens
EndSection
Section "Monitor"
Identifier "Monitor0"
Option "Enable" "true"
EndSection
Section "Monitor"
Identifier "Monitor1"
Option "Enable" "true"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
BusID "PCI:02:00.0"
Screen 0
EndSection
Section "Device"
Identifier "Device1"
Driver "nvidia"
BusID "PCI:03:00.0"
Screen 1
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "0"
SubSection "Display"
Depth 24
Modes "1920x1200_75.00"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Device1"
Monitor "Monitor1"
DefaultDepth 24
Option "TwinView" "0"
SubSection "Display"
Depth 24
EndSubSection
EndSection

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Dual Monitor Startup Problem on MacPro - Solved

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1 - when starting from a cold start the dual monitor positions are reversed from the correct position
2 - additionally the USB and firewire connected devices (e.g. Wacom tablet, 2 card readers) do not function properly.
The workaround for me has been to start the system, wait for the logon screen, then click restart. Upon restart everything comes up and functions correctly.
Specifics on my setup and starting problems:
1 - My main monitor (Monitor #2) is a large gamut monitor that is located to the right. This monitor is connected to card slot 1 as that is the faster card slot (pcx16). The second monitor (Monitor #1) is an ordinary unit and connected to card slot 2 (pcx4). The monitors are set up as an extended desktop.
2. The Wacom tablet (Intuous 3 wide) is connected to USB port on rear of machine. CF card reader by Delkin is connected to Firewire on rear of machine, and an SD card reader is connected to USB on the rear of the machine.
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On a typical cold start, as mentioned above, the apple logo appears on the right and then the logon screen appears on the right.
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I had discovered, that instead of completing the logon on a bad cold start, I could simply restart from the logon screen and all would work correctly.
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mkaito wrote:
That's how dwm behaves. I believe dwm's multihead support is rather lackluster out of the box. You might want to check out some of the patches they have, and ask around in the dwm hackers thread.
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i found the patch , thanks!

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http://www.newegg.com/Product/Product.aspx?Item=N82E16824014373&cm_re=benq_27_in ch-_-24-014-373-_-Product
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You'll probably want something like this:
Mini DisplayPort to DVI (2x DVI Output) Converter
http://www.monoprice.com/Product?c_id=101&cp_id=10114&cs_id=1011409&p_id=8118&se q=1&format=2

Using older iMac as a dual monitor

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Imac dual monitor primary monitor issue

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Thank you in advance.
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- What specific model iMacs do you have?
- Just how are you connecting them?
You may be using Target Display mode
Target Display Mode: Frequently Asked Questions (FAQ)
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BTW, you posted in the Mac Mini desktop forum.

Dual Monitor Set up Stuck at Low-Resolution?

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hi levononick,
Thanks for posting and welcome to the community,
After reading your post I was trying to get a visual on how the back of the desktop looks like. I don't one here to check on so after googling round I'm assuming that your Desktop Back panel looks like the visual below.
Base from what I seen here it appear that your machine do not have the support for having dual monitor. If you see the top (Blue connector) is for the output of a single monitor that is powered by the Onboard graphics. Now the out put below (Also with Blue connector and HDMI) indicates that you are able to have 2 monitors but not extended. One is for the Montor which supports VGA and the other is for connection for HDMI out, to connect to newer TV screens such as LCD or LED tv nowadays, and use them as a monitor.
By looking at this it does appear that you do have extra slot to possibly insert another Graphics card which does support 2 montior displays. You might need to purchase another type of GPU which does this in order to have the Dual support to fuction. Indidcation of the cards with the dual support can be shown below.
This type of can definitely support 2 montior functions and should be the type you are targeting to get fitted into the machine for the support.
Hope this helps.
Please do let me know should you require further clariffication.
regards

Please help with these dual monitor problem

Ok,
Well i am a final cut pro editor and i have a power mac g5 with 1.6 ghz.Its an older one but it runs great for what i need done. Anyway i wanted to go dual monitors so i went out bought a monitor and set it in place. However my graphics card only had 1 DVI PORT (Which had my main monitor on) and the other one was a ADC port. I bought a ADC to DVI-D and then realized it was the wrong one. Those Adaptors are very hard to fine, so i made up my mind a decided to forget that and get another graphics card. However i am not very good with that stuff and i really dont know which one to buy. Some others gave me a list but they were not the same as mine (slots didnt match)
*Here is my card that i have now*
http://www.layton-family.net/stuff/stuff_files/image008.jpg
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If you could find a real ADC to DVI-I adapter, it would work, but the Dr. Botts ADC to DVI adapter
<http://eshop.macsales.com/item/Dr%2E%20Bott/ADCDVII/>
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From their web-page:
"DVI Extractor II makes an ADC-compatible display out of virtually any third-party flat panel display"
Note they say "flat panel".
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Dual Monitor display/firmware difference

I purchased a Pavilion 27xi monitor from the HP Shopping site in October 2014 and purchased an additional 27xi to be used in a dual monitor setup. I received the new monitor this week. The newer monitor does not match the color/white of my existing monitor. When I move a white rectangle so it displays on each monitor, on the new monitor it appears as greenish gray instead of the white of the older monitor. I have done the factory resets, switched display adapter outputs (NVIDIA GeForce 9800 GT), tried one monitor at a time on either adapter output. All with no change in the behavior of the new monitor. The internal setup/control menus of the monitors differ in content and style/color.
Older monitor info: manuf: April 2014, Rev: RIM111
New monitor info: manuf: Dec 2014, Rev: RIM232
I have talked with HP "support" and one person thought it was because of the revision level difference.
I want the display quality of the older monitor, Rev: RIM111. If the monitor difference is because of the revision level, can the newer monitor be put at the RIM111 level. I tried to purchase a monitor with the RIM111 level and was told by HP Shopping that they do not have any at that level. I this a firm level that can be changed? If so how do I accomplish that?

Hello @tomas44,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that the newest monitor you have connected to your desktop computer does not match the color/white of the existing display, and I would be happy to assist you in this matter!
To ensure that your system is properly configured for dual monitor displays, I recommend following the steps in this document on Using Two or More Monitors with One Computer (Windows 8). If everything is setup accordingly, I recommend following the steps below for the newest monitor:
Step 1. Unplug the power cord from the back of the monitor and the wall
Step 2. Hold the power button down for at least one minute
Step 3. Plug the power cord back into the monitor and then into the wall outlet (not a power bar or surge protector)
Step 4. Press the Menu button on the monitor
Step 5. Navigate to the Factory Reset option and select it
Step 6. Try a different cable connecting your monitor to your computer
If the above steps did not resolve your issue you can try the monitor on a computer or other device to see if the issue persists. Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Thank you for posting on the HP Forums. Have a great day!
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

[Solved]Openbox dual monitor crashing

I have been working this out for days to no avail. I have an ATI video card not using the catalyst drivers. Dual monitors worked fine in KDE without any additional setup, and no xorg.conf. In openbox i have tried with arandr, and manual. but when i enable the second monitor its seems that openbox crashes, because whatever is on the screen at the time of enabling the monitor turns to static. I think its openbox because i still have a functional mouse cursor and has proper fucntions accross both monitors in any configuration that i try. when it crashes i have to hard reboot. when i reboot with the monitor still plugged in, both lvds and vga will display a cloned image at the same resolution which is the wrong resolution for both lvds and vga.
I have googled till there is no link unclicked, and wiki give me nothing. i dont believe that i need to set up an xorg.conf as the external is detected fine. its almost like when x applies the settings it corrupts openbox.
anyone have any ideas?
Last edited by zero_one (2010-09-18 18:26:28)

zero_one wrote:you mean add the monitors to a xx-monitor.conf? i can give that a try but it doesnt seem that would provide the flexibility that im looking for as sometimes i use the external monitor disabiling lvds, sometimes right of, and sometimes i use hdmi to my tv set right of, to watch movies.
I mean add the monitors to xorg.conf. Here is the xorg.conf I use with openbox (separate X display for the TV), just to give you an idea - yours will differ with ATI:
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen[0]"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "ServerLayout"
Identifier "tv"
Screen 0 "Screen[1]" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Module"
Load "glx"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
Option "AutoRepeat" "210 50" #added, did no good, use ~/.xinitrc xset
Option "XkbOptions" "terminate:ctrl_alt_bksp"
EndSection
Section "Monitor"
Identifier "Monitor[0]"
HorizSync 31.0 - 83.0
VertRefresh 55.0 - 76.0
Option "DPMS"
EndSection
Section "Monitor"
Identifier "Monitor[1]"
HorizSync 15.0 - 620.0
VertRefresh 15.0 - 600.0
EndSection
Section "Device"
Identifier "Device[0]"
Driver "nvidia"
BoardName "GeForce 8500 GT"
BusID "PCI:1:0:0"
EndSection
Section "Device"
Identifier "Device[1]"
Driver "nvidia"
BoardName "GeForce 8500 GT"
#adjust using 'lspci' or cat /proc/pci
BusID "PCI:1:0:0"
Option "ConnectedMonitor" "TV"
EndSection
Section "Screen"
#nvidia
Identifier "Screen[0]"
Device "Device[0]"
Monitor "Monitor[0]"
DefaultDepth 24
Option "TwinView" "0"
# Option "metamodes" "DFP: nvidia-auto-select +0+0"
Option "NoLogo" "True"
Option "RenderAccel" "True"
Option "AddARGBGLXVisuals" "True"
SubSection "Display"
Depth 24
Modes "nvidia-auto-select"
EndSubSection
EndSection
Section "Screen"
#nvidia
Identifier "Screen[1]"
Device "Device[1]"
Monitor "Monitor[1]"
DefaultDepth 24
Option "TwinView" "0"
Option "UseEDID" "FALSE"
Option "ConnectedMonitor" "TV"
Option "TvOutFormat" "Component"
Option "metamodes" "CRT: 1920x1080 +0+0"
Option "TVStandard" "HD1080i"
Option "RenderAccel" "True"
Option "AddARGBGLXVisuals" "True"
SubSection "Display"
Depth 24
Modes "nvidia-auto-select"
EndSubSection
EndSection
Then I start the second X display on the TV with this in openbox's autostart.sh:
(sleep 5 && xinit /usr/bin/openbox -- /usr/bin/X :1 -layout tv -nolisten tcp) &
Thus there are two instances of openbox running.
It may not give you the flexibility, but for testing it may help you narrow down what is causing the problem and find remedies.
Also, the monitor turning to static sounds more like a driver or X issue than something with openbox.
Last edited by IgnorantGuru (2010-09-18 17:46:12)

How to set up dual monitors with a Mac Mini

The Mac Mini has only one video output port. I very nearly didn't buy a Mac Mini system because I need to work with two monitors. I use the second monitor to display information in Web pages, PDFs, and Word documents while I am working in the main window.
However, I discovered after quite a bit of Googling that it is possible to set up dual monitors using an inexpensive USB video adapter (about $70).
So I bought my Mini (1.83Ghz, 2GB RAM, 200GB 7200rpm Seagate Momentus), and I also bought a USB video adapter called the EVGA Plus.
I've installed this system and used it now for a week, and I am quite pleased with it. So I thought I'd pass this information along to anyone who's interested. Please note that, although this is my first post to this forum, this isn't spam -- I have no financial relationship with any of the companies mentioned here, other than as a customer.
LINKS
EVGA Plus:
http://www.evga.com/articles/409.asp
Their literature does not mention Mac OS X compatibility. However, the underlying technology is made by Display Link. You can download beta Mac OS X drivers from their site:
Go to Display Link to download the beta Mac OS support -- see
http://www.displaylink.com/macbetadrivers.html
The disk image includes a very well written PDF document that explains the driver's status and limitations.
PICS
My Mac Mini setup, with dual monitors:
http://lh5.ggpht.com/BPfaffenberger/SGV5A7lA2QI/AAAAAAAABMI/CBuR4m3uGRA/IMG_0144 .JPG?imgmax=800
The EVGA+ USB display unit - a tiny little thing - driven by Mac OS beta drivers from Display Link:
http://lh3.ggpht.com/BPfaffenberger/SGV49qpHuQI/AAAAAAAABME/b9wo9TZPJdE/IMG_0143 .JPG?imgmax=800
*MORE INFO*
A thread at 123macmini.com on the same topic, including another user's experiences and MUCH better pictures:
http://www.123macmini.com/forums/viewtopic.php?t=19126&postdays=0&postorder=asc& start=0&sid=5a05cb75b90cab5bbc7dfd16b02632c1
NOTES
* The DisplayLink driver is beta. It doesn't support 2D or 3D accelerated graphics. You can't use it to display iPhoto slide shows, for example. However, I need to be able to display a Web page, document, or PDF in the second monitor while I am working in the first. I've found this solution to be quite acceptable for this purpose.
* Several other companies make USB video units that use the same DisplayLink support, so they should work, too. However, they are more expensive -- largely because they're set up to function as port expanders, I believe. The EVGA Plus was the only unit priced under $100 when I did my search.
* USB does not have very much bandwidth, so you might be surprised that to hear that it's possible to use USB to drive a monitor! You'll find that the display isn't as fast as DVI, but for my purposes, I've found it quite acceptable.
* The EVGA Plus comes with a terrible USB to mini USB cable that will cause all sorts of display problems. Replace it with the type of cable that is used to hook up digital cameras to a USB port.
* Once everything is installed, you can use the Displays in System Preferences (or just click the icon on the menu bar) to adjust the second monitor. You can choose display resolutions (depending on your monitor's ability, of course). Rotation works. You can also right-click the second monitor and choose a different background color or graphic.
Don't expect miracles. Don't go this route if you want to run videos or games in the second monitor. And if you get an EVGA Plus, replace that horrible cable!
I hope this information is helpful.
Bryan

There has been quite a lot of discussion here about driving twin displays with the mini, and more recently about the potential for USB video adapters to facilitate this, particularly in the light of several vendors claiming they have suitable MacOS devices and drivers 'almost ready'.
The DisplayLink solution seems to be the one most suggested as viable, though it's a pity they have not yet been able to move their drivers from beta - I suspect that puts a few people off. It's therefore good to hear of a real-world experience that should help others decide whether or not to go this route!

Dual Monitors

I have an 2008 Imac and want to run dual monitors. I have an older flat screen monitor, a Mag InnoVision LT565 15inch.
From what i read so far all i have to do is get the apple mini dvi to vga adapter??
is that right??
thank you

Hello smurffy
If this is the monitor that you want to connect to
http://reviews.cnet.com/lcd-monitors/mag-innovision-lt565-15/1707-3174_7-2066506 9.html
an Early 2008 Intel iMac
http://support.apple.com/kb/SP485
then yes, the Mini-DVI to VGA Adapter (M9320G/A) is the correct adapter.
http://store.apple.com/us/product/M9320G/A
Dennis

Dual monitor issues

Ok so (again) I'm trying to set up dual monitors.
My laptop has no backlight so I use a normal CRT as output
Section "ServerLayout"
Identifier "X.org Configured"
Screen 0 "Screen1" 0 0
Screen 1 "Screen0" LeftOf "Screen1"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "USB Mouse" "CorePointer"
#Option "Xinerama" "true"
#Option "Clone" "off"
EndSection
Section "ServerFlags"
Option "AllowMouseOpenFail" "true"
Option "AutoAddDevices" "False"
Option "DontZap" "False"
EndSection
Section "Files"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/misc:unscaled"
FontPath "/usr/share/fonts/misc"
FontPath "/usr/share/fonts/75dpi:unscaled"
FontPath "/usr/share/fonts/75dpi"
FontPath "/usr/share/fonts/100dpi:unscaled"
FontPath "/usr/share/fonts/100dpi"
FontPath "/usr/share/fonts/PEX"
FontPath "/usr/share/fonts/cyrillic"
FontPath "/usr/share/fonts/local"
FontPath "/usr/share/fonts/Type1"
FontPath "/usr/share/fonts/ttf/western"
FontPath "/usr/share/fonts/ttf/decoratives"
FontPath "/usr/share/fonts/truetype"
FontPath "/usr/share/fonts/truetype/openoffice"
FontPath "/usr/share/fonts/truetype/ttf-bitstream-vera"
FontPath "/usr/share/fonts/latex-ttf-fonts"
FontPath "/usr/share/fonts/defoma/CID"
FontPath "/usr/share/fonts/defoma/TrueType"
FontPath "/usr/share/fonts/artwiz-fonts"
EndSection
Section "Module"
Load "ddc"
Load "drm"
Load "dbe"
Load "dri"
Load "extmod"
Load "glx"
Load "bitmap"
Load "freetype"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc105"
Option "XkbLayout" "us"
Option "XkbVariant" ""
EndSection
Section "InputDevice"
Identifier "USB Mouse"
Driver "mouse"
Option "Device" "/dev/input/mice"
Option "SendCoreEvents" "true"
Option "Protocol" "IMPS/2"
Option "ZAxisMapping" "4 5"
Option "Buttons" "5"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
#Option "DPMS" "No"
#HorizSync 28.0 - 96.0 # Warning: This may fry old Monitors
#VertRefresh 50.0 - 75.0 # Very conservative. May flicker.
ModeLine "1024x768" 44.9 1024 1032 1208 1264 768 768 776 817 +hsync +vsync Interlace
ModeLine "1024x768" 65.0 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
ModeLine "1024x768" 75.0 1024 1048 1184 1328 768 771 777 806 -hsync -vsync
ModeLine "1024x768" 78.8 1024 1040 1136 1312 768 769 772 800 +hsync +vsync
ModeLine "1024x768" 94.5 1024 1072 1168 1376 768 769 772 808 +hsync +vsync
ModeLine "1280x1024" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
ModeLine "1280x1024" 135.0 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
ModeLine "1280x1024" 157.5 1280 1344 1504 1728 1024 1025 1028 1072 +hsync +vsync
ModeLine "1024x768" 113.31 1024 1096 1208 1392 768 769 772 814 -HSync +Vsync
ModeLine "1280x1024" 190.96 1280 1376 1520 1760 1024 1025 1028 1085 -HSync +Vsync
EndSection
Section "Device"
Identifier "Card0"
Driver "ati"
VendorName "ATI Technologies Inc"
BoardName "M56P [Radeon Mobility X1600]"
BusID "PCI:1:0:0"
Option "AGPMode" "4"
Option "ColorTiling" "on"
Option "AccelMethod" "EXA"
Option "AGPFastWrite" "yes"
Option "DRI" "on"
Option "DDCMode" "True"
Option "MonitorLayout" "LVDS,CRT"
EndSection
Section "Device"
Identifier "Card1"
Driver "ati"
VendorName "ATI Technologies Inc"
BoardName "M56P [Radeon Mobility X1600]"
BusID "PCI:1:0:0"
Option "AGPMode" "4"
Option "ColorTiling" "on"
Option "AccelMethod" "EXA"
Option "AGPFastWrite" "yes"
Option "DRI" "on"
Option "DDCMode" "True"
Option "MonitorLayout" "LVDS,CRT"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x800" "1024x768"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "Card1"
Monitor "Monitor1"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "1280x1024" "1024x768"
EndSubSection
EndSection
Section "DRI"
Mode 0666
EndSection
I get that ^^: looks like the VGA screen IS 1280x1024, but for some reason ratpoison thinks it's 1280x800 (all open windows have that size).
this does not happen in DWM, but should work ok with ratpoison too...so I'm guessing it's a wrong setup on my part.
Enabling Xinerama in xorg.conf doesn't even start X at all...it segfaults
What other steps should I take to makea working dual monitor environment? I would like to have 2 X screens btw (my laptop to be screen :1 and CRT screen :0 (the default))

Scratch that..it was working..but silly me forgot to use ":nextscreen" in Ratpoison..so the windows would open at 1280x800 since the damn thing though I'm still on the first monitor

HELP! I have a dual monitor setup and can't use any of them for video??

1)I have a GeForce4 MX 64MB VRAM card installed.
2) the back is dual monitor capable, meaning it has 2 vga (CRT) ports, one on the right and an another adapted plug with a vga port on the end. ( i have no idea which type it was originaly.)
3) I have a big dell LCD
THIS IS WHAT HAPPENED:
the adapter plug ripped off, reveal copper thread things and is now unusable. Although saddened, I was not worried because I don't use a dual monitor anyway and I switched to the other port. BUT THE VIDEO DOESNT WORK ON THAT PORT. I can't figure it out it just doesnt load any video?
the truth is i would rather have a dvi cable set up because i assume its better.
thank you for the help,
I need it

oops! whatever it was I reinstalled OS and it left

Dual Monitor with iMac?

I have a iMac from early 2009 and wanted to use it as an external monitor for my laptop which has Windows 8.1 as it's OS. So my question is without using any software such as Synergy, Air Display, etc is there anyway I can make the iMac an external monitor for my laptop. I also have boot camp set up with Windows 7 as it's OS and I'm not sure if that's any help or not making this dual monitor setup work.
I was going to buy a mini displayport to VGA adapter (iMac (Early 2009) - Technical Specifications says: "Mini DisplayPort output port with support for DVI, VGA, and dual-link DVI via adapter," so I am assuming I cannot use HDMI) and use that to connect my laptop and the iMac together. And so I was wondering if that'll work out if I'm on windows partition in boot camp or not.
iMac Specs: iMac (Early 2009) - Technical Specifications
Laptop Specs: http://www.asus.com/Notebooks_Ultrabooks/N56VM/
Any help would be appreciated, thanks.

Can't do it as far as I know. The mini display port on your Mac is for output only. You need a late 2009 or later iMac to do Target Display Mode Target Display Mode: Frequently Asked Questions (FAQ)

Dual monitor setup - primary monitor blank upon startup

Hello -
This has been vexing me for some time now. I've seen hints of this issue from other people but never the exact same circumstances and never do I see a definitive answer.
I have a dual monitor arrangement on my 8 core Clovertown (first generation) Mac Pro. After shutting the machine down, when I start it back up, the primary monitor almost always flickers very quickly then goes black while the machine boots, and the secondary monitor kicks on. Note - this never happens on restarts or waking up from sleep mode; just after starting up after completely shutting the machine down.
Exact specs are:
The afore mentioned first-gen 8 core Mac Pro (spring 2007), combined with an ATI 4870 graphics card, with the 24 inch Cinema Display LED serving as primary monitor (the one that's useless upon starting up), and my older 23 inch LCD as secondary display. Also worth noting - I'm aware the ATI 4870 is not officially supported in this generation of Mac Pro, however there were so many reports on the web of it working that I did the swap-out myself, and ended up getting the 24 inch LED since I then had the Mini Displayport on the back of my machine.
The only way I manage to get my machine working after starting back up is to restart it several times - literally up to over a dozen attempts sometimes, before the primary display finally does start functioning and I can begin working as normal.
Because there were many reports of the ATI 4870 working fine with this Mac Pro and word of other flickering monitor problems, I thought I'd ask despite the graphics card not being officially supported. Any ideas on how to remedy this problem so I don't have to keep restarting over and over before both my screens eventually work?
Thank you in advance.

So I have the same issue. I run dual 23" Apple Cinema Displays. For a while now the main monitor has had trouble waking up. I have also been unable to put the Display to sleep from the power button on the display. The other monitor seems to go to sleep fine. So when I get it to sleep and it won't start up, I usually restart and everything is fine. Today I can't get that monitor to come up at all. In addition, I have swapped ports on the video card switching the order of the monitors, no change. I also checked in my System Preferences>Display, and the system is still recognizing two monitors. So I am guessing my issue is related to the Display itself. What can be done at this point?

MacPro - Dual monitors - to link to older CRT 4:3 monitor / tv

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