Second display has no input

I've connected two different displays to my powerbook. The computer recognises the existance of the display, but the screens stay black showing no input signal. It used to work properly.
I thought there was a trick to overcome this problem but couldnt find ithere
Any ideas?
Thanks
St.John

Try booting recovery mode.
Try booting from another OS installation or create a USB installer of 10.10 or an older OS (depending on what you have in the app store), http://diskmakerx.com makes that process easy.
If the screen works in any other OS you can start looking at your installed OS. If the screen never works under any OS you can start to look for hardware faults.
Also try Apple Hardware test.
https://support.apple.com/kb/HT1509
NOTE:
Try all tests without any other displays connected.
P.S. I also suggest you create a new topic - this one can become closed at any point if the OP decides it is resolved - other users may ignore resolved topics. Link back to this one for reference.

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Hello KC:
Welcome to Apple discussions.
I do not do what you describe, but see if this article is of help:
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I have a 2.0 GHZ G5 (graphics card is a GeForce 6800 Ultra) that I'm running with two displays connected. I have a Cinema HD display as the main display and a SyncMaster 206BW as the secondary display. The secondary display has two inputs, one for digital and one for analog video signals. Previously, I had the secondary display connected to the G5 with the digital input, and both displays had a very crisp and sharp appearance to the displayed images.
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Hi-
You might have some luck with fine tuning the resolution and refresh rate using SwitchResX.
http://www.madrau.com/indexSRX4.html
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By reading the user's manual, it appears that is possible. Download the User Manual from this link:
http://support.lenovo.com/us/en/products/desktops-and-all-in-ones/ideacentre-b-series-all-in-ones/id...
Chapter 1.1
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I am in the process of buying a flat panel LCD. It has a PC input. I was curious if it anybody knew if it was possible to use the flat panel as a secondary monitor. The trick is I'd like to use it wirelessly. Something as simple as sticking in a Wireless USB hub, and the Mac detecting it as a secondary monitor. (too simple for even the mac? =] )

Hello,
The +iMac (Flat Panel)+ can use a second display via the MiniVGA connector but can only mirror the image of the internal display so if you have the 15" model you can only use a 1024x768 display. I don't think any of the USB/VGA adaptors are Mac compatible (or at least that I've seen).
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Just providing the name of your MB is not enough info. Please supply information for rest of your system, not knowing what kind of RAM, model CPU and other components mates it very difficult to help track down cause your problem.
See my signature below for example of info to provide.
>> Posting Guide <<

24" imac with second display that flickers on and off randomly

Hi, I'm a n00b here, I've read a handful of threads before posting this a I cant seem to find a definitive answer.
I have a 24" 2.4Ghz aluminium iMac and I've recently purchased a HP zr24w 24" IPS panel as a second display, connected with an apple miniDVI - DVI connector.
The screen flickers off, to totaly black every time the mac seems to be having a hard time doing something, be it fast scrolling, flash video, but someimes randomly.
I have boot camp installed with winblows vista (for work) the screen does EXACTLY the same thing, all be it less frequently. This for me rules out the Mac OS, i think it must be something video card/driver related.
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I have spoken to apple care and the very helpful girl I spoke to send me some logging software which I've run and sent the logs back, that may help them out someway.
Any help would be GREAT !!
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well, some time has passed, here's where I'm at so far.
I tried a friend's samsung 24" screen and all was good with the world, no flickering on and off, no black outs nothing, for days it was all fine. I swapped the HP monitor back on and it went right back to its old ways. I called HP tech support, they decided that the monitor was faulty, i returned it to where I got it from and they have sent me a new one. Which was fine, for about 7 hours!!
So, to recap, the mini-DVI to DVI adapter is fine as it worked on the samsung screen, the HP screen is brand new and exhibiting the exact same issue as the first one (cant be 2 faulty ones surely) The samsung screen was fine.
This leads me to think that there is some compatibility issue between the 24" imac and this particular (hp zr24w) monitor.
I have followed apple support's requests for data logging but they cant find anything wrong there.
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http://store.apple.com/us/product/MC094Z/A
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Using a second display

I just purchased a 15" Powerbook and have attached a 23" Cinema Display. I have several questions:
Is it possible to turn off the second display without physically detaching it from the PB?
Is it possible to turn off the PB screen and just use the second display? (I know about getting a second keyboard and keeping the PB closed.)
When I have the two displays in "mirror" mode, I am not getting a full screen on the second display when i use the highest resolution on the second display. Is there a way to correct this and still maintain the highest resolution on the second display?
Thank you very much.

Hi cerett --
I have to preface my responses by saying I don't have a second display attached to my PowerBook. That said, I think I can answer the first two of your three questions. Here goes:
• Is it possible to turn off the second display without physically detaching it from the PB?
I think your 23" ACD has a power button, right? If so, why can't you just power down the ACD if you want to turn it off without physically detaching it from the PB.
Alternatively, and this also goes to my answer to your second question, you could turn down the brightness to the point where the screen is totally dark. Now, this doesn't seem like an ideal solution by any means, because you'd still have power running to the ACD for no reason, but it would seem to accomplish what you want anyway.
• Is it possible to turn off the PB screen and just use the second display? (I know about getting a second keyboard and keeping the PB closed.)
You write that you already know how to use your PowerBook with the display closed. See: http://docs.info.apple.com/article.html?artnum=86286 So, it sounds like you would like to leave your PB open, but just not have the display on. If so, it seems to me you could just decrease the brightness (using the F1 key or, of course, System Preferences > Displays > Display) to the maximum extent possible so that they display goes totally dark. May not be an ideal option (see above analysis), but it would seem that it should work for you.
Sorry, but I can't help with your third question. I'm not sure, but you might increase your chances of getting the information you need, if you reposted that third question in the Apple Cinema Displays forum, here -- http://discussions.apple.com/forum.jspa?forumID=981 -- as the answer to this question may have more to do with the characteristics of the ACD than of the PB. I'd wait to see if someone comes along here first, and, if not, then repost there.
Good luck.
-- JDee

Second display has no input

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