Dual Display Problems - No Signal After Sleep

So, I just set up my hexacore Mac Pro with stock ram and the ATi 5870. To go along with it, I purchased two Dell U2311H monitors from Dell so that I could finally have dual displays. I then purchased two 6' minidisplayport to displayport cables from Monoprice. Also went with the Apple wireless keyboard and Magic Mouse.
Upon initial start-up, everything worked fine. The monitors needed to be calibrated, but dual display mode worked perfectly without any extra steps. I had some fun messing around for a little bit and then decided to take a break. I put the computer to sleep.
I came back 15 minutes later (couldn't stay away for long), and clicked the mouse to wake the computer back up. I heard the tower humming, but the monitors stayed black. I tapped the keyboard. Still black. Assuming it was some issue I wasn't prepared for with the wireless peripherals, I futzed around with them for a while and had no luck. Still not image on the monitors. I turned the monitors off and then back on only to get an error message explaining that the monitor was in Power Save mode. Some further exploration revealed that the monitors were allegedly getting NO SIGNAL from the computer.
Restarting didn't help any. The only thing that has "worked" is shutting down the computer and connecting a single monitor through the DVI-D cable that came with it. I can then reconnect the displayport cable and switch the input to re-establish dual displays, but this is obviously pretty annoying. It seems like I can eliminate questions with the monitors themselves or the cables. In doing some research, I've found some threads on different sites about people having similar dual display issues attributed to faulty graphics cards. I certainly hope this isn't the case, but I'm at a loss for what the problem might be. It seems odd that dual displays would work briefly only to fail after going to sleep for 15 minutes.
Sorry if this is the dumbest question ever. Is there something stupid that I'm doing wrong? Anyone have any insight?
Any guidance you guys can provide would be greatly appreciated. Thanks in advance!

I have the exact same issue. Here's the forum I've got going: http://discussions.apple.com/thread.jspa?threadID=2686085&tstart=90
I called AppleCare because this issue was out of the box. Engineering wanted to capture some logger information so I ran the logger and sent it off to them.
I am running a Dell 27" via a DisplayPort to Mini-DisplayPort cable (also purchased through Monoprice) and a Dell 22" via DVI to DVI (have also tried with the DVI to DVI cable connected to an Apple DVI-MiniDisplayPort adapter and the same issue arrises). When I boot the computer with any of these cables, I get no video. Only when I boot with a Dual-Link DVI (DVI-D) cable from the 27" monitor do I get any video on screen. At this point, I can then plug in the DisplayPort to Mini-DisplayPort cable and the regular DVI (not Dual-Link) after unplugging the DVI-D cable and I get video. If I restart the computer, no problem. However, if the computer goes to sleep or if I power down and then power back up, I am back to square one with no video and have to resort to using the Dual-Link DVI cable.
Because this was DOA out of the box, they ended up just RMA'ing the machine and re-ordering my CTO Mac Pro 6-core. Still waiting for it to be built, I'll let you know how it goes on the second machine when it arrives.

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Another dual display problem - GeForce FX 5200

I've seen lots of questions about dual display problem, situation when trying to connect two non-apple vga displays to your graphic card.
I have GeForce FX 5200 graphic card, with 2 display output's. And two DELL 17" vga LCD displays.
I manage to connect 1 display regulary with dvi to vga converter, but for other display I tried several difrent converters ADC to DVI to VGA, and it just did NOT work.
G5 could see other display in display settings, in arrange option I coud see two identical displays, but I don't get anu picture (desktop) on other display???
Is it problem with output's on my graphic card (Gforce FX 5200), could it be soloved with some ADC to VGA converter?
P.S. Dr. Bott ADC VGA Extractor is not compatible with GeForce FX 5200????
G5 dual 2.1Ghz Mac OS X (10.3.4)

I've seen lots of questions about dual display
problem, situation when trying to connect two
non-apple vga displays to your graphic card.
I have GeForce FX 5200 graphic card, with 2 display
output's. And two DELL 17" vga LCD displays.
I manage to connect 1 display regulary with dvi to
vga converter, but for other display I tried several
difrent converters ADC to DVI to VGA, and it just did
NOT work.
This won't work if the ADC to DVI adapter is not passing through the analog signals needed for VGA.
G5 could see other display in display settings, in
arrange option I coud see two identical displays, but
I don't get anu picture (desktop) on other
display???
Is it problem with output's on my graphic card
(Gforce FX 5200), could it be soloved with some ADC
to VGA converter?
Yes.
P.S. Dr. Bott ADC VGA Extractor is not compatible
with GeForce FX 5200????
It should work. On Dr. Botts web-site it says:
"VGA Extractor is compatible with any video card with an ADC port in a PowerMac G5"

No signal after sleep

My mac Mini awakes from sleep (I think) but my Viewsonic display shows "no signal".
I cannot see anything in the documents to suggest an adjustment that would help.

Hi Tim,
See if it's related to this...
The 2012 macs (and later apparently) not waking normally from sleep after hours being in sleep. (noted here ...
http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
"Why 2012 iMac/2012 Mac Mini won't Wake After Hours of Sleep (Hibernates/Powers Off)")
The sleepimage file still reappears even if never slept. Delete it (hibernate off, etc) - within minutes its back.
A note on that here - http://www.xlr8yourmac.com/feedback/Chameleon_SSD_Optimizer.html
About iMac sleep...
http://forums.macrumors.com/showthread.php?t=1529750
Try this: "sudo pmset autopoweroff 0" and "sudo pmset standby 0"

Dual displays problem

Hi,
I just bought two new displays (2x BenQ FP222, 22" widescreen) to use with my new Mac Pro 2.66 (GeForce 7300 GT), but here's the problem: When only the first display is turned on the computer is fine, but when both displays are switched on the picture on both displays goes black every few seconds and then comes back.
I have connected both displays to the computer via 5-metres DVI-cables, which my dealer said would be ok. I understand that I only have the standard graphics card, but as far as I know that shouldn't be a problem unless I try to use dual 30 inch displays.
It sounds to me like it could be a problem with the computer not having enough power to run the two displays (they both use 1680x1050)? Or could it be a faulty DVI-cable?
Has someone got any idea what might be the problem?
/Neworld
Mac Pro Dual 2.66 Mac OS X (10.4.8)

Have you updated the firmware on the nvidia to the latest? Just a thought, but to your comment about powering all the cards...... the power supply will give only 5 volt for each PCI interface rail. The monitors get their power from the AC outlet. As robust of a machine the Mac Pro is, I doubt it will have any issues powerwise even if all of the slots are full. The ATI card requires an additional power cable because it is a much faster card and requires more power than the slot it is in can give it. The nvidia card is smaller and has no fan, only a heatsink. It isn't drawing near the current that the ATI card will, and I haven't seen many, if any posts about dual displays not working on the ATI. Flickering, yes...... but not that it doesn't work. I agree with the other folks that have posted, it's a hardware issue with your video card, or the cables used to hook up the monitors, or possibly the displays are not standard in the way they use the DVI signal.... You can troubleshoot by trying your known good Apple CD on each DVI output, then place it on one DVI and try the BenQ on the other DVI. Make sure you power down in between your tests. This is to make sure you don't blow something, and the video card can reset itself to which display is hooked up. Do either of the BenQ displays work with DVI on either output?..... once you layout your results, you may see a pattern that will help you explain the problem to Apple. I think they may need to send you a replacement video card, but I'm not there to see what is happening. Playing out the scenarios you tested usually makes them pay attention, instead of calling and saying it doesn't work. They put all these issues into a database that they search when customers call with issues. Wow, have I been long-winded!
Good luck
Michael

Dual Display Problem with new MacBook Pro

Hi All,
I just got a new MacBook Pro Core 2 Duo and a 30" Dell LCD Monitor. Both are AWESOME products, BTW. But I am having a weird issue with running both displays.
If I sleep/wake the computer so that I'm never running with dual displays, everything seems fine. However, no matter what I try, I eventually get a system hang if both displays are active at once.
For example, if I turn the MBP off, attach the monitor, and power up, the MBP will get to the login screen. As soon as it hits the logon screen, it hangs.
If I hot-plug the monitor while the system is running, it will detect the new display and activate it as a secondary desktop. But, in anywhere from 5 seconds to 15 minutes (varies each time) the MBP display will turn off and the system hangs.
To me, it seems like a video driver bug or something similar to that?
Thanks!

To those of you that inquired, NO, I have not yet resolved this problem.
I took the laptop into the Apple store, and they decided that it needed a new logic board. Then, once they received the part, and I took the laptop in for repair, they didn't replace the logic board. The guy on the bench reset the PRAM and decided that the problem was resolved. I took it home, and within about 20 minutes the same thing happened.
When I took it back to the store, I was unable to reproduce the problem for the mac Genius.
It still does it, I I just haven't had a chance to take it back to the store to try to reproduce the problem again.

Problems auto-connecting after sleep & startup (Changed from WPA to WEP)

Okay, I know there have been several issues similar to this, but after two days of sifting through posts, I still can't resolve this.
A few days ago I switched my AirPort network security from WPA to WEP-128. This was required to allow my Nintendo DS to connect to the netwrok, by the way. After the change, two similar, but slightly different problems started:
My 15" PowerBook G4 no longer auto-connects to the network at startup. The network is listed in the drop-down, and connects with no problem when I choose it manually. The computer seems to have no problem re-connecting after waking from sleep, which is odd because...
My other PowerBook, a 12" G4, won't auto-connect at startup AND won't re-connect after sleep. As above, it has no problem connecting using the Keychain once the network is selected from the drop-down.
So far I have tried, on both machines:
- trashing the system airport prefs
- deleting and resetting the network's keychain entry
- repairing the keychain (no errors found)
- turning off some unneeded power mgt options
- disconnecting USB peripherals
I have also reloaded the software on both my AirPort Extreme base and my AirPort Express hub, as well as restarting both hubs. I've also made sure that AirPort is at the top of the network connection list.
Both laptops are running 10.4.3 and have all the latest software updates installed.
What am I missing?
Thanks.

Both of these replies are helpful, in that they help confirm something I figured out this morning, almost accidentally.
One thing I didn't mention was that during the change from WPA to WEP I changed the network password. Now, I assumed that since the Keychain seemed to be working and I could get on the network manually without needing to enter the password each time, that meant the new password had correctly propagated throughout the system.
So, this morning I go into the Network settings, switch from Automatic to Preferred, select my network, look at the properties, and notice that somehow it has way too many bullets for that to be the correct password. I re-entered the password and that seems to have solved the problem. The new password I had entered somehow didn't make it into this setting. I guess trashing the network prefs, or renaming the network would have had the same effect.

Problems waking up after sleep since 10.8.3 update

A couple of weeks ago, I updated to 10.8.3. Since then, I have been having difficulty waking the machine after sleep. I get the constant beach ball. On a forced restart, I will get the spinning gear followed by the prohibitory sign, like it can't find the OS. I have tried rebooting in safe mode, resetting PRAM/NVRAM, repaired disk and disk permissions with disk utility, checked the status of hardware with (AHT), reinstalled OS X (twice), but the problem persists. I'm at a loss and have no idea what else to do.
I'm seriously regretting upgrading from Snow Leopard at all.
I've been trying to run time machine to back everything up, but my external USB backup disks keeps randomly unmounting, so I can't even get a solid backup now.
Please help.

No, it has nothing to do with being Friends or not.
There are more and more security issues with java, Oracle comes with updates almost every few weeks. Until lately Apple had it in theuir distribution system, but because of the security issues decided that it was not good business to distribute automatically this leaky system. So with new system updates the Java is removed to make sure the customers reinstall the latest version. You can download from both Oracle and Apple, but don't download from any other source.
Luckily I do not need it anymore and have not installed Java since a few months.

10.10.3 dual display problems

Like a few other on 10.10.3 with multiple displays i have started having issues with Dual display in that i have a third party application (Freeway Pro 7) which has been working fine, I use the second display to display a variety of other windows, since 10.10.3, OSX cannot seem to remember where these windows should be between sessions of using the App.
So i can use the third party app, then switch to Mail , then back to the third party app and the various windows are all on the main display and the second display has nothing on it at all.
What is going on Apple.

I did not mention this before, but i have another system based on the MacBook Pro and this issue does not appear on this unit.
This system is a registered system on the Public Beta program so i thought it may not be relevant.
John

27Xi stays on displaying "no source signal" after I turn off my PC or PS4, doesn't enter sleep mode.

I started having this issue a few weeks ago. The monitor no longer enters sleep mode for whatever reason after I turn off my devices connected to it (currently my PC via DVI and my PS4 via HDMI), it turns on and displays a box with "no source signal" and never goes to sleep. Before it displayed a box with "monitor going to sleep" for a few seconds and the panel turned off as the montor entered sleep mode. This is extremely annoying. How do I fix it? What's wrong with it? I already tried a factory reset.

Hello, try this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive & clear caches.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.

No Video Signal After Sleep or Standby

Hi guys. I have a mystery that I'm hoping you have an decent answer to. Sounds like a common problem but mine has a few twists from the issues I've read about.
Whenever my monitor is turned off or goes on standby, the computer stops sending out the video signal. The monitor will not come back on unless I unplug the monitor from the back of the computer for a few minutes or I restart my computer. Sometimes one solution works while the other doesn't and it isnt consistant.
The monitor was tested on another computer and it works well. I bought a graphics card but no difference. I even tried my HDTV plasma (which became an option because of the new graphics card) but that does the same thing.
The computer is an HP Pavilion a6219h running Vista 32 bit home premium with Service Pack 2.
The problem was with the video output that's integrated into the motherboard.
The monitor is a ViewSonic VX2235WM-5 Model VS11349.
Message was "No Signal" on the screen.
I disabled all the sleep features, Set everything to never and saved. Problem still occurs.
I bought and installed an nvidia GEFORCE GT 630 graphics card. Switched from PCI to PCIe in BIOS. Still the same problem.
With this new graphics card, I hooked up the computer to my plasma hdtv via an hdmi hook up. Same problem. No matter what I do, the screen works until it is either turned off or goes on standby.
It still keeps doing it.
At this point I think it must be the motherboard. I've also read online it could be the power supply? What do you think? Is there anything else I can try?
This question was solved.
View Solution.

Hi,
You can download a free application like CPU-Z or Speccy to find your RAM frequency and many other internal features of your computer.
CPU-Z: http://www.cpuid.com/softwares/cpu-z.html
as you said you also installed 2 new RAM's along with Graphic Card,
also check your graphic card drivers... may be they are not set to display when wake up!
Try to download updated software for your graphic card..
Hope this helps
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MBP C2D -- display not coming on after sleep, hd is spinning, hard reset re

HI,
After using my new Macbook Pro Core 2 Duo 2.33 for a few days, randomly after opening the lid while Macbook has been sleeping the display will not come on, no illumination whatsoever. The hard drive is spinning.
The only recourse I have found so far is to do a hard shutdown by holding the power button.
any known solutions?
MBP C2D 2.33 Mac OS X (10.4.8)

No, my laptop is treated like a desktop replacement, so it doesn't move. And no peripherals connected.
Hope Apple has corrected the logic board problem by now, though anything is possible as my Macbook is the first production run of the Core 2 Duo.
Will try booting from install disk and repair permissions. Hopefully this is it. (Migration Utility failed miserably when i tried to copy over my user files from my old Powerbook 800. While it said it was doing the copy of my documents etc., it failed to copy any of them across. Migration Assistant even said it was successful.)
Thank you

IMac Display not turning on after sleeping for a while

Hey Guys,
Minor issue I've had with my iMac for the last few days, when I wake up I tend to nudge the mouse to turn on the display before taking a shower so that everything is ready for when I get back. However the screen isnt coming on and I'm having to press the power button to sleep the iMac then wake it up again by pressing the power button 5 seconds later, after that, all is good.
Any ideas? This has been since upgrading to 10.6.4
Thanks

Yeah I might think it's overheating too, but the harddrive always makes this strange noise before the crash happens, so it could be related to the hdd? Or in the worst case, the motherboard.
Any tips on how to check for overheating? I have tried to run temperature monitor software, but the only sensor it detects is the hdd, and it looks fine.
I haven't opened my iMac fully ever, just the user serviceable parts. I installed an Airport card about 1 month before this started happening, could this be related?
Pierre, what did you do when your iMac started overheating? How did you fix it? Mine just full crashes and the screen goes weird. Thanks for your answer.

Display not coming on after sleep

Alright so ive looked for awhile and found this is pretty common, except all ive found talks about either imacs or macbook pro. I have an early 2008 model macbook with snow leopard. This has been happening for quite a long time, even before installing snow leopard. If the computer goes to sleep either from time lapsing, or mostly how it happens, from closing it, most of the time i cannot get the display back on until i restart by holding the power button down. Everything ive seen on here so far, nobody has an answer, so does anybody know how to fix this problem yet?

the first thing to try is resetting the pram/nvram
http://support.apple.com/kb/ht1379
if this doesnt work it could be a loose display cable.

Black display when opening iBookG4 after sleep

Occasionally the display will remain black when opening from closed while sleeping. After some repeats it kicks in again.
Could it (after 5 years) be a failure of the switch that is activated by opening?

Steven,
Could it (after 5 years) be a failure of the switch that is activated by opening?
Yes, actually it's a reed switch that's activated by a magnet when you close the display. They can actually break or get flaky and the display will do what you describe.
You might try resetting the PMU since it controls sleep:
http://support.apple.com/kb/ht1431
Otherwise you could disconnect the reed switch. In this model it's under the main deck to the right of the keyboard.
It connects to a socket just foreword and right of the RAM slot so you might be able to disconnect it through the RAM access port. It has a red and black wire.
Be careful doing this as it's easy to damage the board.
Richard
Richard

2008 iMac, display not coming back after sleep, requiring SMC reset and more.

I have a 24" 2008 iMac that's recently started giving me migranes starting a couple weeks ago. It's the kids' shared computer in the bonus room, and one of them comes in and tells me it's not working. I go in, and it seems like it's off, but I can hear the fans going. Won't respond to mouse, keyboard, even hitting the power button that usually pops something up warning that I'm about to shut it down with people still logged in. So I hold the power button down to force it off, wait a minute, and turn it back on. I hear the superdrive sounding like it's trying to load a disc, but there's nothing in there . . . keeps making that noise again and again. No startup chime, no display, nothing, just the superdrive sound. Can't get it to boot. I come to the support site and go through resetting the SMC - unplugging it for 15 seconds. That at least takes care of the superdrive sound, and I get the startup chime, but no video.
I go a step further, unplugging it and plugging it back in while holding the power button down for 10 sec. When I hit the power button after that, it comes on, display nice and bright, but the fans are now running full speed. Another article tells me to reset the SMC for that, which I do, and now the fans are working properly and the system is working again.
Problem is, I wind up having to go through this whole thing every other day. If I follow the steps of unplugging it, holding the power button down while I plug it back in, turning it on and booting up, shutting down and resetting the SMC to make the fans slow down, it will work. But it's random as to when it happens, and I'd really like to know why it could be happening and what I can do to fix it for good and not have to go through the whole thing to get it back up and running. Is it simply on its last legs? Do I need to restore the OS (Snow Leopard upgrade)? Do I need to take it to the Genius Bar and pay them to look at it and diagnose it, and God knows how much to fix?
Or, do I recycle it and just bite the bullet and get a new one? Any thoughts would be greatly appreciated, thanks!
Andy

the first thing to try is resetting the pram/nvram
http://support.apple.com/kb/ht1379
if this doesnt work it could be a loose display cable.

Dual Display Problems - No Signal After Sleep

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