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iMac Core Duo problem - Flickering after Display Sleep Mode

6674 Views 103 Replies Latest reply: Jan 1, 2007 12:08 PM by Marcus Muench1 RSS
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Thorne^ Calculating status...
Currently Being Moderated
Jun 2, 2006 4:05 PM

There are two Firmware Updates

1. The SMC 1.0 for System Management Controller
2. The Firmware Update 1.01 for the Boot-Rom

They Update to following Versions:
Boot-ROM-Version: IM41.0055.B03
SMC Version: 1.1f5

After the SMC Update was everything fine, but after the Firmware Update 1.01 is a Flickering visible on the Display, if the Display Sleep Mode was on, and let wake it up. It reminds on the interlace effect, known on CRT.
It disappears after a few minutes, take more time after a few hrs of sleep mode.
Received my iMac on Monday, but dont think its a a Hardware failure, because it happened right after the Firmware 1.01 Update and Display sleep mode.
It was fine after the SMC Update.

The Firmware Restoration CD works only if the Firmware Update was interrupted or failed.

I think a new Firmware with a bug fix will be the solution. Or if they offer a downgrade Firmware Update as temporary solution.
iMac Core Duo 20" | Boot-ROM-Version: IM41.0055.B03 | 512MB DDR2 |, Mac OS X (10.4.6), | SMC Version:1.1f5 | Radeon X1600 PCIe 256 MB | MATSHITA UJ-846
  • colourpixels Calculating status...
    I'm getting exactly the same symtoms on my 20" iMac dual core. I had a problem earlier, which had them replace my display, but even this new one exhibits the same "interlacing" type effect you're getting on wake up (or even just coming back from extended period of screen being off from energy saving settings)

    Other people getting this, or is it another faulty display that should go back?


    iMac 20" - 2Ghz core duo - 2Gb Ram, Mac OS X (10.4.6)
  • hcshih Calculating status...
    I have exactly the same problem.

    Only happens if wake up from monitor-off mode. However I hit problem a couple days after SMC update, while then I haven't done the firmware update. I tried the firmware update later but still in vain.

    I still feel it's firmware/SMC problem. It the logic board is faulty it should have consistent behaviour, not just happens after monitor sleep.
    iMac core duo 20", Mac OS X (10.4.6)
  • hcshih Level 1 Level 1 (0 points)
    Hello hcshih
    Thats why i think its simply a Firmware bug,
    should be easy for Apple to fix it.

    Apart from the flickering after the Firmware Update,
    is the Display of my iMac very good, no pixel errors,
    it shows everything very good, brilliant and
    naturally. And he is very quiet and surprisingly fast
    with 512MB Ram.

    I agree with you. That's why I don't bother to return
    my iMac to Apple since it is perfect in any other aspect
    apart from that could-be firmware problem.
    iMac core duo 20", Mac OS X (10.4.6)
  • emanuele Calculating status...
    I got my new iMac three weeks ago ca. I bought it for video editing, 256 MB graphic card, 2gh, 2gb memory and so on...

    Two times happened to me the same problem with display. After quit Final Cut Pro, the computer and not only the display went in sleep mode. As I returned and wake up them the display was funny and I just was able to shut down by pushing the start button. Apple told me to make a PRAM, but after few days it happened the same. I got no idea of Firmware and updating it, but in this forum I've learnt that it has to be updated, so that the problem 'probably' came from that. I've done this, I also in the preferences have said just the display to go in sleep and not also the computer, and since then the display it's going ok.

    Now I'm not a technician, but if my case could help you to understand 'something', who are more related with hardware problems, I'm happy.

    I'm reading of lot of us having problems with displays and this. Is there something to do as Apple Customers?

    iMac, Mac OS X (10.4.6)
  • emanuele Level 1 Level 1 (0 points)
    ok, but how can you be sure that it won't cause problems? And if it has to be done? Rufst du die Apple an?
    iMac, Mac OS X (10.4.6)
  • Link Zhang Calculating status...
    same problem here, I'm waiting for the new firmware update from apple.
    iMac Core Duo 20", Mac OS X (10.4.6)
  • abecker Calculating status...
    My new iMac is coming in a few days, from what I read this problem does not happen until you update the firmware.

    Is there any way to avoid this firmware update, or does it come with the current shipment of iMacs?
  • myhighway Level 5 Level 5 (7,270 points)
    "Dont think the Boot-Rom Firmware 1.0.1 will be pre-installed."

    Once the new logic boards with the new firmware incorporated into their design begin arriving at Apple from their manufacturer, then yes, ALL new iMacs will have it "pre-installed" as you call it. Actually, it is not software at all.
    20" iMac intel 2GB; 20" iMac G5 iSight 2.5GB; 20" iMac G5 ALS 2GB; iBook; others, Mac OS X (10.4.6), DSL to AP Extreme wifi net w/HP 6840 wireless printer
  • myhighway Level 5 Level 5 (7,270 points)
    "same problem here, I'm waiting for the new firmware update from apple."

    This is a posting of mis-information. Please read the "Terms of Use" for these forums. Look for it in the right hand column.

    The Firmware Update 1.0.1 - IS the new firmware update. It is the second one posted, and when it was posted the original update was removed and has never been seen at this website since then.

    Many thousands of iMac Intel owners have performed the Firmware Update 1.0.1 without issue. It is to YOUR advantage to have your machine up-to-date. Get it over with, so that you know whether you finally have gotten a good iMac. If not, it will just find another way to fail you.

    What will you do next year if this firmware update is a REQUIRED MINIMUM for installing Leopard? It is to your advantage to do it now, before your machine becomes mucked-up with third party devices and third party software. Besides, without the firmware update your warranty service will be compromised. Best of luck to you, whatever you decide.
    20" iMac intel 2GB; 20" iMac G5 iSight 2.5GB; 20" iMac G5 ALS 2GB; iBook; others, Mac OS X (10.4.6), DSL to AP Extreme wifi net w/HP 6840 wireless printer
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