Just bought a brand new 24" iMac and matching 24" LED Cinema display. Clean 10.6 installation out of the box. Day one, everything working ok except if I let the system sleep for a while the iMac will wake up if a key is pressed or mouse moved, but the display will not. No problem if its been asleep for a few minutes or even half an hour but leave it say 6 hours (say I'm downloading something overnight) and I get this problem. It will work again if I reboot the iMac or disconnect the display's power though just disconecting the display from the iMac display port doesn't seem to fix it.
Has anyone got any ideas? Apple tech support had nothing except suggesting resetting the PRAM. At the time I wasn't aware the problem was only happening after an extended period of sleep so I thought it was fixed but its clearly still there. Help!
R
iMac 24",
Mac OS X (10.6.1),
24" LED cinema Display
"Me Too" It started about 2 years ago. Finally I called Apple support they shipped me another video card it seemed to work for a period of time but then it re-appeared if the monitor was left on to long. Now I can not get it to wake. I tried another monitor to ensure the card worked - it did work. Plugged my monitor back in nothing. Got the short - long - short blinking which tells you to check the power adaptor - its the right power adaptor. Maybe my adaptor has gone bad?? Maybe not. I used to unplug the monitor from the computer and unplug the monitor and let it sit for 15 minutes. That always use to work. I am now in the middle of letting it sit to see if it works this time. I will report back if it works.
Not sure if I have a bad machine or not. It appears very slow at startup, it took me 11 hours to Load Logic Studio? It seems to take twice as long to startup vs my 23 inch iMac 4gb mem, 2.9ghz. Anyone else experiencing these issues. I would expect with Quad core and 16gb memory on the i7 would be lightening fast yet it appears to be turtle slow with basic operations - especially loading software.
Genius Bar was no genius. He plugged in my monitor pressed the button and it did not wake up. The Genius said it would cost me $400 I asked what if its a fuse or something simple - he stated it was $400 no matter what. Seeing how this has happened to THOUSANDS of customers you would think they would perform a recall. I have checked numerous other sites and the # of people who have experienced this same exact issue is in the thousands. I am positing my Displays specific info which you can find by going to "About This Mac" under your apple and clicking on Display.
OK so I paid the $400 for the repair. I got a call a week later and they told me that instead of repairing the screen they would just replace it with a new "up to date - their latest LED Display". Cudo's to Apple I am very happy with this outcome. They are the best in customer service.
I had this same problem, too. Oddly though, ONLY when he display was connected to my G5 Dual 2.7 tower. When I unplugged the display and immediately plugged it into either my MacBook Pro or my Mac Mini, it would work every time.
I tried all kinds of voodoo with resetting various things on my G5 tower, unplugging/replugging, moving the display power adapter to another surge strip, etc... everything I saw in various forums.
*WHAT FINALLY WORKED FOR ME:* I unseated the video card, blew off the connectors with compressed air and reinstalled it. At the same time, I pulled the second drive I had installed in the tower (original drive is 250GB and I had put in a second 80GB drive). Rebooted the system and the monitor started up just fine.
I'm skeptical that this issue lies only with the monitor's power supply. After spending 6 hours trying to resolve the problem, I question the following as possible culprits:
1. Could our computers be drawing the necessary power away from the monitor? In my case, pulling that extra drive could have been the solution.
2. Could our connectors just be dusty? I've noticed a lot of posts around this issue are running big machines... towers and Pros. These generally run hotter and keep their fans moving... creating more dust. In my case, both my other machines that the monitor connected fine to are very clean inside. My MacBook Pro is new so of course it's clean. But my mini is older than my tower, and is still perfectly clean inside... likely due to the fact that I barely use it. But my G5 tower that had the monitor problem is my workhorse... the fan is constantly running. When I opened it up I was shocked at how filthy it was. Martha Stewart would have gasped at the sight. Perhaps the connectors on these monitors are extra sensitive?
3. Could the issue lie in VRAM? In my case, pulling the video card and reseating it would have cleared the VRAM, yes?
These are just thoughts I'm throwing into the mix for consideration, based on what worked for me. I'm just glad to have it working again. Apple should be of more help with this issue... their support documentation on this is terrible... reflects the fact that they have no clue what the problems are and/or they don't care to dive down into something so complicated in order to help us.
*I buy Apple so that these things won't happen.*
Apple, we shouldn't have to hold torches to our computer equipment and flit about in voodoo power strip dances to get our expensive machines to work.
I just had this problem with my refurb 24" aluminium cinema display that I've had for 2 weeks. Shut down on Saturday evening and Sunday morning the display wouldn't wake up. I tried moving it from my iMac to the Macbook Pro, then back to my iMac, but to no avail. The display was detected, but no image was displayed (I thought it was a backlight issue). I carted it down to the Genius Bar today, the Genius plugged it in and it worked fine! He said that unplugging the monitor for 15 minutes would have reset the SMC controller on the logic board of the monitor, which probably fixed the problem. I wish Apple technical support would have suggested this on the phone when I rang them BEFORE I went to the trouble of taking it to the Apple store!
So is it a logic board issue? I have the same issue... If it goes to sleep it will not come back on. I have to shut it down all the way to have it wake up.
Here are the specs for my Video/Display
ATI Radeon HD 2600 XT:
Chipset Model: ATI Radeon HD 2600
Type: Display
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 256 MB
Vendor: ATI (0x1002)
Device ID: 0x9588
Revision ID: 0x0000
ROM Revision: 113-B1480A-252
EFI Driver Version: 01.00.252
Displays:
Cinema HD:
Resolution: 1920 x 1200
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Rotation: Supported
Display Connector:
Status: No Display Connected
I just experienced this very issue when starting my CPU this morning. After restarting, resetting the PRAM (made no difference), disconnecting and connecting the monitor cable from my MacBook (still no difference) - I unplugged the powercable from the back of the Cinema display, and plugged it in again while my laptop was on (and all cables from Cinemadisplay connected to the laptop). This forced the screen back on and it works a treat.
Wish there was a powerbutton on the display, as yanking the cable out feels like an extreme measure.. but if that's what it takes..
I have the 27" Cinema Display with the most recent 12-core Mac Pro, OS 10.6.5. Everything is a month old. Today I had to restart it several times because it would not wake up from the sleep mode. Not much help from Apple - zapped pram and ran disk utility/Repair Disk Permission - with apparently no luck (it just did it again).
I already had the problem with the sound I read about in other posts (which was resolved by zapping the pram). And a flickering issue with the video and audio (repaired by replacing the graphics card - it was one of the mini ports). If it makes anyone feel any better, this Mac is a replacement for my 2-year old Mac Pro, Duo Quad 2.8ghz which kept shutting down on me. What is going on with Apple?
After reading these posts, I'm turning the sleep off and either taking the display back or exchanging it. Why waste more of my time?
I'll add my two cents by stating I have the very same problem with my 24" iMac and a 24" ACD. Put it to sleep for a short while and the ACD will wake shortly after the iMac. Put it to sleep overnight or shut the entire system down and the ACD won't wake at all.
I know the ACD is recognized by the iMac because it shows in the Monitor Preference panel. But there is no picture at all. Additionally, I have two items connected to the USB ports of the ACD and none are alive. That points to power management, as far as I'm concerned but is it from the iMac or the ACD? How to go about to find out?
So I took my iMac in the Apple Store to have it examined, and of course, everything works well. Just the same, the Genius decided to order the logic board as well as another part for the ACD, and will call me back when the parts arrive at the store.
To start the New Year with gusto, the ACD works fine today! What changed today? It's much warmer outside, so the temp inside rose by one or two degrees... Maybe shining a light inside it or lighting a candle when it gets colder again will work...
Okay, since my last post on 29/11, my ACD died again. So I took it back to the Perth Apple store for the second time but this time it didn't work there either. They replaced the logic board and I got it back within 3 days and everything worked fine....for a few days.... then it happened again! I had it all unplugged ready to take to the Genius Bar again, then I thought I'd try in one more time before doing so, and it started working again!!! Interestingly, it came back to life when I plugged my iPhone into one of the USB ports on the back. Since then, I've disabled sleep on my Mac and kept it running 24/7 with the odd reboot between OS X and Windows 7 and everything has been fine. Except for one time when I plugged my iPad into one of the USB ports on the ACD and it died, then I changed to another one of the USB ports and it came back to life again. Very strange behaviour.... I'm starting to think this might be a general issue with the logic boards on these things which will probably never be resolved...
