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IMac with Snow Leopard doesn t work without second display connected

5032 Views 23 Replies Latest reply: Oct 27, 2010 1:51 AM by Skyrickk RSS
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Skyrickk Level 1 Level 1 (0 points)
Currently Being Moderated
Sep 26, 2010 1:37 PM
Hi,

I've a iMac 24" and I would like to resell it urgently.

But I've a big problem, if I disconnect my second display (belinea 20"), the iMac screen become grey or blue after many second.

If I boot system, after the grey clock : nothing, grey or black screen.

The Os is snow leopard disc, update version (10.6)
The iMac version is iMa8,1
The EFI bios is : IM81.00c1.b00

I tried :
Reinstall with format
Utility disc on boot cd (scan disk & rights repair)

Even when I try to boot cd without second screen, I ve white screen
(after a update to 10.6.4)

Help me please
MacPro4,1, HD4870
  • Antonio Rocco Level 6 Level 6 (10,100 points)
    Hi

    Try resetting the Parameter RAM (PRAM) - pronounced peeram. Restart the mac and depress the alt, command, P and R keys simultaneously. You should hear the boot chime. Keep the keys depressed until you hear the boot chime a further three times. On the final boot chime release the keys and let the mac boot normally.

    Tony
    iBook G3 (10.4.11)
  • rkaufmann87 Level 8 Level 8 (40,530 points)
    Tony,

    With due respect the instructions you provided for resetting the PRAM are incorrect. The correct instructions are found in the following Apple Advice letter:




    Resetting your Mac's PRAM and NVRAM


    Regards,

    Roger
    iMac and Macbook Pro, Mac OS X (10.6.4), iPhone 3GS Airport Extreme Airport Express
  • rkaufmann87 Level 8 Level 8 (40,530 points)
    Try this, select System Preferences-Startup Disk and choose your internal HD. I have to be honest I don't really know what is going on with your system so I don't know if this will help of not.
    iMac and Macbook Pro, Mac OS X (10.6.4), iPhone 3GS Airport Extreme Airport Express
  • Antonio Rocco Level 6 Level 6 (10,100 points)
    Roger

    The instructions given to reset PRAM are exactly the same as those given in the Apple Document.

    Tony
    iBook G3 (10.4.11)
  • rkaufmann87 Level 8 Level 8 (40,530 points)
    Hi Tony,

    I don't how these instructions are the same, here is what the article says:



    _Resetting PRAM and NVRAM_

    • Shut down the computer.
    • Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    • Turn on the computer.
    • Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
    • Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    • Release the keys.

    Your original post said *"Restart the mac and depress the alt, command, P and R keys simultaneously. You should hear the boot chime. Keep the keys depressed until you hear the boot chime a further three times. On the final boot chime release the keys and let the mac boot normally."* How I understand your post that totals 4 chimes vs. the 2 Apple specifies. Am I missing something?

    Message was edited by: rkaufmann87
    iMac and Macbook Pro, Mac OS X (10.6.4), iPhone 3GS Airport Extreme Airport Express
  • rkaufmann87 Level 8 Level 8 (40,530 points)
    I'm sorry I really don't know what's going on with your system. What I can recommend is making an appointment with an Apple Store and bringing it in to be looked at. They may be able to help you trouble shoot it.

    Good luck!

    Roger
    iMac and Macbook Pro, Mac OS X (10.6.4), iPhone 3GS Airport Extreme Airport Express
  • ChangeAgent Level 1 Level 1 (140 points)
    Not sure if this helps, but do a search in these forums or maybe a Google, I seem to remember there was a problem like it a while ago and lots of discussion about it. hopes this helps.

    Alternatively you might run Apple Jack (http://applejack.sourceforge.net/) there might be some funny stuff stored on your Mac over time and now that it hears it has to leave you it thought I dig out some trouble and see if I can stay. no seriously AppleJack sometimes solves funny things like it.

    Succes.
    MBP, MM, MBP - 10.6 + Windooz XP on a hard partition
  • Antonio Rocco Level 6 Level 6 (10,100 points)
    Hi Roger

    I understand. I don't take the support article too literally. In my experience sometimes two PRAM Resets is not enough. I have done 5 or even 6 in the past after doing one or two and they have fixed the problem at that time. As long as it's two or more then you have a fighting chance of it possibly fixing the issue.

    Tony
    iBook G3 (10.4.11)
  • ChangeAgent Level 1 Level 1 (140 points)
    I agree on the Pram reset. more does not harm and is sometimes better.

    Good luck!

    Does anybody know what (and where) the plist is that might hold crucial information? Removing it might do the trick.
    MBP, MM, MBP - 10.6 + Windooz XP on a hard partition
  • WZZZ Level 6 Level 6 (11,875 points)
    This always gets confused. It's a total of 3 chimes. The startup chime + 2 more. (But I don't think 4 chimes total does any harm.)

    Antonio Rocco wrote: In my experience sometimes two PRAM Resets is not enough. I have done 5 or even 6 in the past after doing one or two and they have fixed the problem at that time. As long as it's two or more then you have a fighting chance of it possibly fixing the issue.


    Tony, are you saying several PRAM resets may fix a problem where only one doesn't? Never heard this before. This is very interesting, if true. You mean reboot 2 or more times with PRAM resets each time?

    Message was edited by: WZZZ
    iMac G3/400 OSX 10.4.11, iMac 21.5" OSX 10.6.4
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