Plugging/Unplugging DVI cable protocol

I've got my powerbook connected to an external monitor when at my desk via a KVM switch. The KVM switch is finicky with regards to monitor activation and I've discovered I need to have it on and my powerbook on & running when I plug & unplug the DVI cable from the port on my powerbook in order for it to work just right.
I'm wondering if that is healthy for my powerbook or not(?). Will I hurt it by plugging & unplugging the DVI cable to & from the DVI port on the PowerBook whilst it's awake & running? Is it "plug 'n' play" like USB etc is?
If I have the powerbook asleep, plug in the DVI monitor, then wake it up, the monitor & powerbook don't see each other. I have to either restart or unplug & replug whilst it's awake. Conversely, if I put my powerbook to sleep, then unplug the DVI cable, it wakes my powerbook up. Thus my reason for asking.
thanx.jason.

Thanks for your response Joe.
I pulled up the manual for my 17"er and found all references to DVI plugging. It does appear that the PB is on when it's plugged in but does not say that specifically - it could just as easily mean to plug it in then boot - it's just not that clear.
Well, I have one more month to decide wether or not to extend the Apple Care Warranty - I probably should do it since I've already had some issues with it.
RE: http://discussions.apple.com/message.jspa?messageID=1129506
Thanks for your help - though I'd still like to hear more thoughts/experience/knowledge/etc.
-jason.

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Really strange: plugging in DVI cable turns off powerbook

So I just bought a new KVM: an Avocent Switchview DVI. 4-port DVI/USB switchbox, very nice.
Problem is, if I plug the (known good) ADC 23" Cinema Display (with ADC->DVI converter) into it, and then plug it into my Powerbook, and then turn on the Powerbook, as soon as the Powerbook detects the external display and starts using it, it (the Powerbook) shuts itself off. If I hot-plug it while the powerbook is on, it detects the display, starts to use it, SHOWS THE 'Are you sure you want to shut down?' DIALOG BOX ON THE CINEMA DISPLAY, and THEN turns off.
It's like the DVI connector has a sensor for the power switch in it, and somehow this KVM is triggering it. (I note that the power button is directly on top of the DVI connector... could this be interference?) It's driving me totally nuts.
And then there's my G4 Cube, which works fine with the cinema display, but just doesn't detect it at all when it's plugged into the KVM. It's like they're trying to drive me crazy or something.

Just in case someone is curious, it appears Apple uses the 'hot swap detect' pin on DVI in a non-standard way, at least according to the admittedly biased manufacturers of my DVI switchbox. If I pull the pin out of the cable, it no longer detects hot swaps, but also doesn't turn off my computer when I hook it up.
Of course, my G4 Cube still doesn't work properly with it, so it's basically a worthless piece of junk to me, but hey, that's what you get when you believe the spec sheets, I guess, right?

Is it OK to plug/unplug Thunderbolt cables with power on?

I know USB does not require power down first, but Thunderbolt?

If you're unplugging a drive - be it Thunderbolt, USB, FireWire 800 - be sure and unmount the drive(s) before disconnecting the Thunderbolt cable.
Clinton

Is any difference where i plug DVI cable from 2 port on card?

Hey. I want only ask. Is there any difference where i plug DVI cable to that card? Or not?
Cable:
http://www.morele.net/digitus-kabel-dvi-24-1-dual-link-dl-2m-ak-320101-020-imp-486650/
Choose first or second port? Or this doesnt matter? DVI-I or DVI-D no difference ?

http://nvidia.custhelp.com/app/answers/detail/a_id/221

Mac Pro 2x2.8 quad will not power on unless I unplug, then plug-in power cable, why?

It is a 2x2.8 Quad Intel Mac pro, 8GB Ram, 8800 GT Video Card (running dual monitors), 10.6.8, Dual Internal HD (150/250), Single external HD (1TB), Dual Internal Burners (DVD - Stock/Blu-Ray - Pioneer), no PCIe cards installed.
I installed a brand new power supply thinking that was my issue, but it still does not power on after an extended period (1/2 hour or so) of being shut-off. It also at times will shut itself off after periods of inactivity even though it is set to never go to sleep, nor are the HD's set to sleep when possible.
One clue to give is that it IS set to restart after power failure. So when I go to press the button to turn the puter on and it is non-responsive, I then unplug and plug the power cable back in to the rear of the puter: it automatically starts-up as if there was a power failure.
The other possible clue I have is that my bluray burner is connected via SATA cable to one of the 2 open SATA connectors on the Motherboard. It only has issues when the hard drives ARE set to sleep when possible. When they are awoken, the drive is no longer listed as present. Meaning I cannot open the drive drawer. ;(
I am thoroughly upset about this.
Benjamin

It is a 2x2.8 Quad Intel Mac pro, 8GB Ram, 8800 GT Video Card (running dual monitors), 10.6.8, Dual Internal HD (150/250), Single external HD (1TB), Dual Internal Burners (DVD - Stock/Blu-Ray - Pioneer), no PCIe cards installed.
I installed a brand new power supply thinking that was my issue, but it still does not power on after an extended period (1/2 hour or so) of being shut-off. It also at times will shut itself off after periods of inactivity even though it is set to never go to sleep, nor are the HD's set to sleep when possible.
One clue to give is that it IS set to restart after power failure. So when I go to press the button to turn the puter on and it is non-responsive, I then unplug and plug the power cable back in to the rear of the puter: it automatically starts-up as if there was a power failure.
The other possible clue I have is that my bluray burner is connected via SATA cable to one of the 2 open SATA connectors on the Motherboard. It only has issues when the hard drives ARE set to sleep when possible. When they are awoken, the drive is no longer listed as present. Meaning I cannot open the drive drawer. ;(
I am thoroughly upset about this.
Benjamin

A plug/unplug of the cable between the laptop and the iPad leads to a shutdown of the McBookPro

a plug/unplug of the cable between the laptop and the iPad leads to a shutdown of the McBookPro
who can help me ?
or what shall I do ?

First, try another cable. If that doesn't do it, make a Genius Bar appointment and take in both the MBP and the iPad.

I have an HDMI to mini DVI cable issue!

Recently my cable i use for my TV stopped working and i can't sort out why. when connected, my computer goes blank (black) and yet if a video is playing i can hear it. problem is i cant seem to get out of the black screen even if i disconnect from the TV. i have to shut down the computer manually because it seems to be stuck. what could it be??? bad cable? bad port? i do not leave my computer connected all the time, so could it be plugging and unplugging the cable from the computer? it worked simply for the longest time so i can't imagine what happened. i heard maybe a mini DVI/HDMI adapter on my computer might be a good idea too. please advise.

Hi hayesjdr78,
Thanks for visiting Apple Support Communities.
If you no longer see video when connecting your Mac to your TV, try these steps first:
Check connections
When using an external display be sure to check the following:
If you're using an Apple notebook, confirm the AC power cable or adapter is securely connected to the computer and the cable providing power to the display is also secure. It is always good to have your notebook connected to AC power when an external display is in use.
Confirm display adapters are fully seated in their respective connections and that they are supported models and for the computer and display. Refer to these articles to assist you with adapter compatibility and further configuration information:
Monitor and Display Adapter Table
About Mini DisplayPort to HDMI adapters
Apple Mini DisplayPort adapters: Frequently asked questions (FAQ)
Thunderbolt ports and displays: Frequently asked questions (FAQ)
Remove all display cable extenders, KVM switches, or other like devices and retest to determine if the issue is resolved.
Try unplugging the video adapter or cable and then plug it back in.
If more than one video adapter is in use (or "daisy-chained"), troubleshoot by using only one adapter.
Example: A mini DisplayPort to DVI adapter connected to a DVI to HDMI adapter is an unsupported configuration because there is a series of adapters in use.
If available, try using a different display and or adapter (or use a different connector by using DVI instead of VGA, for instance).
Reset the systemYou can reset the Mac's parameter RAM and SMC.Reset the resolutionStart by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
The full article has more information that you may find helpful:
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573
Regards,
Jeremy

Infinite blue screen flicker when Macbook plugs into DVI monitor

I have a black Macbook Core 2 Duo 2.2 ghz connected to an HP w2207 monitor through a DVI cable using the Apple-supplied DVI adapter.
Often, when I plug the HP monitor into my macbook, the HP monitor will flicker a light blue color and be unable to pull up the image on my Macbook (will continue flickering blue indefinitely until I unplug the monitor, at which point my Macbook's screen will come back to life and I can work normally from that screen). If I restart my computer, the monitor will work fine.
What I would like to know is if there is anyway to get around this so I don't have to restart my computer. I can't tell if it's a software or hardware issue since it does always work fine when I restart. I would even be ok with going into activity monitor and terminating some process if that's what would allow me to plug my monitor in without restarting.
Thanks for helping!

I tried messing with the DDC/CI setting on my HP monitor, and there was no change in behavior.
I also tried deleting some system-level plist files, and that caused my entire computer to be unbootable ( see http://discussions.apple.com/thread.jspa?threadID=2090478 ) until I restored those files to their proper location.
Any suggestions on things to reset/files to delete to really flush the software side of the connection between my Macbook and my monitor? It never used to do this and now every other time I plug in the monitor all it does is indefinitely do the blue flicker dance (as an fyi my warranty is up, so no calling Apple).

Satellite A205: Dynadock - How to connect to LCD TV with HDMI to DVI cable

I recently purchased this product and had a problem when connecting it to my LCD TV.
I used a HDMI to DVI cable to connect it to the TV. Only a small portion of the full display shows on the TV.
I have adjusted all setting on the laptop (Satellite A205) but it only adjusts the laptop screen, not the TV.
I also used the adaptor to VGA, plugged it into the computer input on TV, same effect. I can use VGA output on side of laptop to TV ok.
Any ideas on how to adjust dynadock output settings?

First of all it would be interesting to know what dynadock you have exactly; one with DVI port or one with VGA port?
>I have adjusted all setting on the laptop (Satellite A205) but it only adjusts the laptop screen, not the TV.
You should know that the dynadock has a own built-in graphics controller and video drivers to control the video stream.
Therefore you should change the settings directly in the dynadock settings and not on the laptop!!!
Greetigns

Macbook can't detect external display via DVI cable

I just bought Samsung PX2370 monitor and attempt to connect it with my Macbook Aluminum (late 2008). I have mini display port to DVI adapter and DVI cable. When I hook up my Mac, nothing comes up. The screen on macbook goes blue briefly and then back to normal, but nothing has been detected. I've manually set the source of signal to DVI, and tried to use Detect Display but nothing happens. Even I try to detect the monitor by using Windows 7 (via bootcamp), the display remains idle.
I had tested the monitor using DSLR although by HDMI, it work.
Any help would be much appreciated.

Hey hparekh and welcome to the forum -
It looks like you have the correct hardware. You should check your connections... make sure your using the Mini DisplayPort and not the Ethernet port (common mistake) and all of the connections are plugged completely. Make all of your connections with your MacBook on and then turn your Dell on. You might need to go through your Dell's setup to make sure that it's recognizing a DVI input rather then HDMI.
Might be a bad DVI cable or a defective monitor or maybe a bad Mini DisplayPort to DVI adapter. Are they all new products?

Why no use a DualLink DVI Cable with the MiniDP-DVI adapter to power 30"?

I'm a bit confused here...
looking at my Mini-DisplayPort to DVI adapter, the pinout appears to be a Dual Link DVI port. Is this true?
Can someone explain to me why I can't just buy a Dual Link DVI Cable now and use this to power my 30" monitor at its native resolution?
I would have thought this was gone over many times already - but I have been unable to find it.
Am I missing something?

A Mini DisplayPort to single-link DVI adapter just has to connect pins between to two connectors. The computer detects the adapter, and send DVI signals over the Mini DisplayPort connector that end up on the correct DVI pins. Unlike DisplayPort, DVI uses separate data and clock video signals, and there are not enough DisplayPort signals to handle clock and video for dual-link. The Mini DisplayPort to dual-link DVI adapter contains circuitry to separate video and clock signals from self-clocked DisplayPort signals, so can drive all the required pins on a dual-link DVI port. This circuitry gets power from a USB cable that plugs into the computer. This makes it more complicated and more expensive than the single-link version.

HDMI 2 DVI cable -- can get 1080p...sometimes

I have a Westinghouse LVM42W2 1080p monitor. When I plug Apple TV into the HDMI input, I have an option for 1080p resolution (along with several others), but when I use an HDMI-->DVI cable I just have a choice between 1080i vs 720p.
However, if I first connect the Apple TV to the monitor with the HDMI-->HDMI cable, set the resolution to 1080p then change the cable to HDMI-->DVI, there is a new option for "1920x1080p - 60Hz" selected along with 1080i and 720p. I checked the monitor and Apple TV is broadcasting in 1080p.
Now if I change the resolution to 1080i, the option for 1080p disappears. So I can't really use 1080p with the HDMI-->DVI cable.
Any thoughts?

I wouldn't worry too much about the i (interlaced)/p (progressive) distinction as that indicates the type of scan, the resolution is still 1080. It may be that using an HDMI-->DVI cable throws off the signal sensing either on the ATV or your TV. Ultimately, if the picture quality is good, there's nothing to fret over.

Notebook Toshiba L40 don't start when unplug power cable

When i unplug power cable system don't start and crash on login KDE or faster. When power cable is plug everything is ok. Tested on Kubuntu 9.04, Windows Vista and works ok. On Kubuntu 9.10 alpha 5 i have the same problem.
Sorry for my english

Hello AmlnnN,
I understand have you finished doing a little maintenance   work on the computer it now freezes periodically is that correct? I will do all I can to help you resolve this issue.
First thing lets run a couple test on some of your hardware.
See steps below:
1.       I want you to boot into the bios menu this link will show you how.
2.       Once in bios go over to the diagnostic option at the top.(Note you will need to use the arrow keys to navigate)
3.       You may see 2 test there if that is the case run both test.
4.       It may take some time so please have the ac adapter plugged in.
5.       Once the test finished press F9 to setup defaults and then press F10 to save and exit.
Also find out while you’re in the bios if the computer ever freezes there.
Pleas respond back with your results at your earliest convenience.
Thank You
Clicking the White Kudos star on the left is a way to say Thanks!
Clicking the 'Accept as Solution' button is a way to let others know which steps helped solve the problem!

Need to extend my DVI cable from my Mac pro to my Apple 23" cinema display

I need to extend my existing DVI cable to the maximum allowed distance (without using a repeater) of 3m or 15'. This means I need a 12 foot extension cable Male to Female. I don't need to extend the USB or Firewire ports.
I've searched the threads and seen discussions but am interested in feedback from someone who has actually done the extension and is happy with the outcome.
I understand that the 23" monitor can use a single link cable and that the interface is DVI-I. Anyone tried this?
Many thanks for the help!!
Mac Pro, 2.66GHz, 4GB mem, 2TB storage Mac OS X (10.4.8)

The graphics board has a DVI-I port, but since the Apple display only uses the digital signals, you can use a digital only cable, which might be a bit cheaper. Take a look at the female connector on the cable, though. Make sure it has holes for all the pins on the display's plug. The plug may have the analog pins, even though it doesn't use them.

System froze when I plugged in ethernet cable, was this the cause?

I had wifi on when using the net, and then I plugged the ethernet adaptor into the thunderbolt port and plugged the ethernet cable into the adaptor, the system froze, the mouse or pad wouldnt work, so I forced shutdown,
was plugging in ethernet the cause of the system freeze? Should I have turned off wifi prior to plugging in ethernet?
Or should I not plug in ethernet while the laptop is on?

System.log -- I'm using Lion, not Mountain Lion, but for me, one opens the Console application (in the Utilities folder) and look along the left side panel for system.log.
Also in the Console application you can look at DIagnostic and Usage Messages and also at All Messages. You'll be looking for something that sounds like a problem at the exact time that your freeze occured.
I've been doing this "hot plugging and unplugging" of the ethernet cables for years with several Mac laptops going through 10.6 and 10.7 (probably have done this a few thousand times) and have never actually experienced any issues while doing it. The area where I have seen some issues is with the laptops sleeping and not waking up properly, once in a while this has happened, but that's not related to what you had happen. Again, I was using 10.6 and am now on Lion (10.7) [employer hasn't upgraded us all to Mountain Lion, although that will happen shortly], so 10.8 might be a little different.

Plugging/Unplugging DVI cable protocol

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