We did get our problem solved. Apple sent us an application that gathered all the activity on our computer and then the file was forwarded on to their engineer. (The application was "CaptureData8.4.1.dmg") The engineer went to the last time the display shut down and found there was a serious conflict going on with my HP Software! We uninstalled the HP software and now I'm running my HP printer through Image Capture. We have not had a problem since. (He also saw that there seemed to be some conflict issues with MS Office so I will get the newest MS Office 2011 just to make sure, but so far okay.) No Apple IT I've talked to since has ever heard of this. I'm just sayin'...
Very interesting! I too have some HP software on my iMac, and wouldn't you know, my HP printer has been a pain in the butt the last few months.
Can you ask that engineer if he would be so kind to send that same dmg to my address? I too would love to get to the bottom of this!
By the same token, how do you drive a printer via Image Capture?
Same here!!! I have a HP printer and associated drivers installed on my machine. I may try removing it for a period of time and see how I go with the monitor. GuyBruce, if this is the solution then I will declare you an absolute champion of the Mac world! This is the first possible explanation I've seen for this issue, which appears to have been experienced by a large number of people. I mean, how many HP devices are out there? It is definitely a plausible explanation.
What's this "Image Capture"? I've never heard of it.
Uninstalling my HP printer didn't work for me. However, I have found a "bandaid" solution to my problem. When the monitor won't wake up, plugging something into the rear USB ports seems to do the job (i.e. wake the monitor up). Sometimes it takes a couple of goes. I will leave something plugged in to one of the ports (a card reader). The USB connection must be more effective in waking the monitor from sleep compared to the mini display port alone.
I tried that 'solution' myself a number of times, and though it worked a few times, eventually, it stopped working. I'm waiting for my ACD to return from Apple with new components on board, and I'll attempt to uninstall my HP printer. For what it's worth, my printer is a LaserJet P2015.
I also have a DeskJet 5800 at the cottage, so I'll have to uninstall that too.
The problem I have with HP software in OS X causing this issue is that I have the same problem in Bootcamp (Windows 7 Professional 64-bit). So I can't blame my particular problem on HP software for Mac. I'm almost certain in my case that it is a hardware issue. I've had the logic board replaced, and that doesn't appear to have helped. The "all in one" cable is most commonly brought up as the cause of this problem, but I'm not sure how one would rectify it ( don't know if replacing the cable would help at all).
The USB port solution has worked for me for a couple of days, but I'll give it a week or two before I'm confident it is a solution. This discussion has been very helpful - thanks to all involved.
The engineer walked me through the process of switching the printer software to the Image Capture which came with my Mac. The conflict seemed to be with the HP Software, not the HP printer itself. I can suggest calling my case worker: Halmar 877-416-4271 x5583. My case #192057284. He sent the Capture Data application and forwarded it to the engineer who helped me. (All this was under my Apple Care.)
$1000 for ANY Monitor is an outrageous price to pay, let alone one with inherent problems. I have been a long Apple customer having spent THOUSANDS over the last 3 years alone. My latest upgrade was adding a second 27" LED Cinema Display to match my first Apple 27" LED Cinema Display.
Right away after installing the 2nd Apple 27" LED Cinema Display a problem occurred. Using a Radeon HD 5770 board which has 2 Mini Display Ports, I figured this 2nd Apple LED Cinema Display was a perfect set up for my 2006 Mac Pro 1,1 3GHz 8 Core. Unfortunately, when the computer went to sleep, it suddenly could not be made to wake up! Interestingly before connecting the 2nd new LED Cinema Display, I removed a Dell 24" 2407 Display. With the Dell connected via a DVI port and ONE 27" LED Cinema Display there was NO problems ever. However, with the 2nd Apple LED Cinema Display connected, once the LED screens went dark, and as much as I tried, I could do nothing to get the computer to wake.
To make a long story short, I use a wireless Bluetooth Mouse and Keyboard. Before hooking up the 2nd LED Display the 2 dongles (for the Logitech Mouse and Keyboard) were connected to the Apple Cinema Display and not the Dell Monitor. However, the Dell Monitor had a USB line connected to it as I get my Compact Flash pictures from the built in card reader port on the Dell Monitor. So after all else failed I moved the 2 USB Dongle Bluetooth receivers to the MAC PRO itself. Now my computer wakes up.
I am shocked that Apple Computer would allow a product as expensive as an LED Cinema display to be sold to the public with an inherent design flaw that affects the onboard USB's port's ability to initialize a sleeping Mac Pro computer system. YES, the screen is magnificent, but you have a USB port that was not designed to send signals to the MAC PRO after the screen goes into sleep mode.
I can understand an odd failure, but NOT when this is a known and broad technology issue and Apple acts like nothing is wrong and each and every new complaint brings the same shrug of the shoulder. That is exactly the type of American corporte management philosophy that has hurt American industry and it appears Apple might not be that different in this regard.
It appears to me that APPLE has abandoned much of its computer division or lessened its role in favor of more profitable iPods and iPhone divisions. Certainly the 2010 Mac Pro flag ship computer is lagging technology considerably going into Q3 of 2011. I am starting to get the very strong urge to abandon Apple and head back to the PC World and Windows 7. If what I saw today is an indication of what the future holds for me as an Apple enduser, I will have no choice but to spend my money elsewhere.
Okay, I am a new victim. I swapped out the power supply and it worked.
However, I think my solution and others listed are work arounds. I believe this is an "Apple" issue that Apple engineers need to fix.
I have the following equipment:
7 year old 23" CD purchased second hand (presumably a month after original owner purchased)
a year old iMac running 10.6.8 (purchased new);
a 7 year old Pwr Book (purchased new)
I purchased the iMac so I could run Windows (a POS) in a VM. In other words, my Pwr Book still works.
I first experienced the CD issue 3 weeks ago after a power failure. I tried the monitor with Pwr Book and it did not work. Therefore, I thought the failure may have fried my "brick" power supply so I purchased a used one (I tried using an ohm meter, but leads were too thick).
In the meantime, I used a new Dell display without issue.
When I received my new/used supply, I was able to use the monitor. However, I went to lunch and come back to find that my monitor will not come out of sleep mode.
I find this posting. The only suggestion I tried was waiting 15 mins, which did not work. Therefore, I tried my initial/original pwr supply and low and behold, my supply comes on.
Based on the responses, I changed my display settings to no longer go into "sleep" mode.
Time will tell, but as I stated initially, I truly believe this is an Apple issue associated with either new hardware (ie intel), new OS, both or something totally different.
My two Cent's to the choir...
I stumbled upon this discussion while looking around to find eventually a glue for a person who has opened his own thread about a similar problem.
So I read thru the posts here and found many useful ideas but at least I missed one essentially thing.
OK, there may be a problem with the power management options, worth to try a SMC reset in some cases.
OK there may be rare cases with applications or 3rd party software preventing the graphic adapter from sending the signal or lowering the available amount of power due to extreme stressing the system.
But as you may have noticed, the problem comes up to one regardeless of the used Computer, OS X or Windows version, display type or brand.
For that, the mostly useless but common "yesterday with my -whatever you want to read here- all was well" attempt gives me the clue and start blinking a little red LED in my rotten brain.
Back in time when I worked as Tech on support desk, exactly the same problem had risen up several times.
The solution was (in the very most cases) neither the graphic card, the display nor the OS. It was the wake up signal itself.
The display expects a defined current pulse as wake up signal and graphic cards (if not broken) will transmit that signal normally.
But the point is, this signal must have also a specific signal strengh to trigger the displays internal adapter to switch on.
There are exact ISO/ANSI defined standards for that but there are also defined tolerances for the signal as well for the sender (graphic card) as for the receiver (display)
Even though these tolerance band is narrow, if the sensitiveness of the receiver is on the higher end of the tolerance and the signal from the transmitter on the lower end the displays internal adapter may not recognize it well and therefore fail to switch ON the display.
Not to forget: Also every changeover within a electrical line decreases the current!
For (extreme) example:
Wake up signal definition may be: Current pulse on line (pin) Y have to be 5 V +-1.5 V / 200 mA +- 50 mA to trigger "wake up"
The transmitter (graphic adapter) sends 3.5 V 150 mA (passing factory tests with o.k. "in tolerance")
The receiver (display interface) passed factory tests as o.k. "in tolerance" with a sensitiveness for wake up current pulse on 6,5 V / 250 mA.
Even as both systems are passed as O.K., the customer expierience of the above (when connecting this two units) is clear: "No wake up after sleep"
Some may have had a quite similar experience with external USB hard drives. Some spin up after plug in, some with a different cable, some never "but on my other computer..." and even in some cases the computers USB interface displays a "shoot off" error.
So what can one do?
- Swap Display until you found one that works, even of same brand and model
- Swap graphic card until u find one matching (not a good idea with onboard graphic)
- Swap computer until ... (Mostly not a usable way)
- Try a cable with less resistance; e.g. a shorter one, better fitting contacts, larger cross-sectional area.
- Best: Try a direct connection e.g. a MDP to DVI-I or MDP to HDMI cable.
At least, never use a adaptor-cable-adaptor solution.
I hope that will help some people with this problem.
Cheers - Lupunus
I've continued to have the screen flicker / wake from sleep issue with my refurb 24" LED cinema display since my earlier posts above. Replacement of the logic board by Apple did not solve the problem. Therefore, I decided to replace the power supply (the internal board, not the cable). I bought one from eBay for about $100 USD. When I received the new power supply I noticed it was a different brand - the original one in my display is manufactured by Lite-On, while the new one is manufactured by "Delta Electronics". I believe they are both genuine Apple parts though.
Anyway, I've replaced the power supply and I no longer have the flicker / wake from sleep problem. I'm very relieved to no longer have this issue!
I was having similar issues... nice 20" cinema display completely black with no signs of waking up...
I followed the SMC reset instructions here:
(using the Mac Pro desktop instructions to turn off computer, unplug for 15 seconds, plug back in, wait 5 seconds, then power back up.) I did this and then unplugged and replugged the power source for my cinema display...
My first attempt at steps listed above led to high RPM fan and still screen life after reset... a bit odd....
Everything seems to be working normally again (for now).
Thanks to other posts for pointing me in the right direction.
Lupunus, your explanation makes the most sense. The setups are ALL different; some with MBPs, others with Mac Pros, others using PCs with adapters, I'm having issues with AppleTVs (gen 2 and gen 3 tried). Apple's Cinema Displays appear to be extremely difficult to turn on. This is a case where Apple's obsessive simplification has made a right mess of things, yet no one at Apple is acknowledging the problem! Engineer a dongle that boosts the turn-on signal from weak signals! Every other display I've tried turns on using the same setup, which is Apple TV to Kanex DVI-MDP adapter to 35 ft 23 awg MDP cable (Samsung 22" and 24" monitors, LCD TV, etc.) but the Cinema Display doesn't. What's worse, it has deteriorated over time from working about half the time to not working at all, and this even after I removed a 2-way MDP switch that was in the signal chain AND a 6' MDP extension cable.
I was searching for a way to force it to turn on, and the USB device idea sounded promising, but no dice. I tried a Bluetooth dongle and a USB keyboard, and nothing. Oddly, I get audio - clicks, I activated the Voiceover option by hitting the AppleTV remote's "menu" button too many times, and now it keeps saying "Welcome to AppleTV. If you require Voiceover to use Apple TV, press the small button located on the lower right of your remote three times" every 15 seconds or so. But the USB keyboard won't light up at all, no CAPS lock or num lock light at all. So frustrating.