How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Claws224 Your Own Question

Claws224
Claws224, IEEE Network Engineer, Microsoft
Category: Computer
Satisfied Customers: 5182
Experience:  approx 20 years of experience from software to hardware design
5195814
Type Your Computer Question Here...
Claws224 is online now
A new question is answered every 9 seconds

24 iMac starts to black screen

Customer Question

iMac worked fine for 3 months-Now startup or wake from sleep results in black screen. Unplugging all cords and waiting results in full startup. Have run all Disk Utility and TechTool dig and fix options. Problem persists-HELP
Submitted: 6 years ago.
Category: Computer
Expert:  RoeIncarnate replied 6 years ago.
This is a known issue with the newer iMacs.

I think it may have been fixed in the 10.5 updates

If you are using 10.5 (Leopard), then please make sure your system is up to date by running "Software Update" from the Apple menu.

If you are running 10.4, then you may want to look at upgrading to 10.5.

If this is the answer to your question, please kindly select * ACCEPT * so I can be rewarded for my efforts.
Customer: replied 6 years ago.
Reply to RoeIncarnate's Post: No mention of this problem on Apple site.

Have up to date Tiger and Leopard OS on separate internal HD volumes.

I removed all connections from external devices and power - Waited- Then plugged only power cord back in. Boots fine. Connected printer and 3 external HD's back in and all is still fine - For now anyway!

Here is log from this morning when initially startup again didn't work:

4/16/08 8:59:07 AM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
4/16/08 8:59:07 AM com.apple.launchd[1] (org.cups.cups-lpd) Unknown key: SHAuthorizationRight
4/16/08 8:59:07 AM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
4/16/08 8:59:07 AM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
4/16/08 8:59:14 AM org.ntp.ntpd[26] Error : nodename nor servname provided, or not known
4/16/08 8:59:21 AM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[80]) Exited: Terminated
4/16/08 8:59:22 AM com.apple.launchctl.Aqua[88] launchctl: Please convert the following to launchd: /etc/mach_init_per_user.d/RemoteUI.plist
4/16/08 9:25:18 AM com.apple.launchd[75] (0x1095d0.Locum[276]) Exited: Terminated
4/16/08 10:00:58 AM com.apple.quicklook[353] failed to find start of cross-reference table.
4/16/08 10:00:58 AM com.apple.quicklook[353] missing or invalid cross-reference trailer.
4/16/08 10:04:46 AM com.apple.launchd[75] (0x10b0e0.Locum[359]) Exited: Terminated
4/16/08 10:04:51 AM com.apple.launchd[75] (0x10b150.Locum[360]) Exited: Terminated

Sad to say I don't know what to make of this.


Also, on short term sleep and restart, both versions of OSX will restart fine.

24" iMac is three months old and has been a dream all along.

We were away for a week and iMac wouldn't startup when we got back.

Had left a 17" Powerbook running and it was still fast asleep and runs fine.

All cheap surge "protectors" were still on.
Expert:  RoeIncarnate replied 6 years ago.
I wouldn't worry about those meessages. 10.5 seems to spit more stuff into the logs than 10.4 did.

The "convert the following to launchd" is a warning to the developers to use Apple's new system for starting system processes. That is a harmless warning message.
More info on launchd is here: http://developer.apple.com/macosx/launchd.html

org.cups is the printing system in OS X.

I don't think I'd worry about any of the other messages either.

Maybe trying Reseting the PRAM, it can fix all kinds of weird problems:

-Restart the iMac
-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.
More detail here http://docs.info.apple.com/article.html?artnum=2238

I found one person that says a workaround for the black screen it to turn on the "Require password XXXXX wake this computer from sleep or screen saver" in the "Security Preference Pane".
More info: http://www.macobserver.com/tip/2007/04/23.1.shtml
Customer: replied 6 years ago.
"Answers" were not helpful as they covered very basic fix options which I had already done. It would seem the author would have known I must know a fair amount about my Mac as I stated I had already run all TechTool and Disk Utility options.
Expert:  RoeIncarnate replied 6 years ago.
I'll opt-out so others can chime in if they have ideas.
Expert:  Claws224 replied 6 years ago.

Hi,

Could you perform a test for me?

Could you prior to walking away from the machine disable the airport card or whatever networking device you use and then see if it still does the black screen upon wake.

Let me know

Thanks

Eric

Customer: replied 6 years ago.
Hello RoeIncarnate & Eric--

Per earliest post is was both reboot from shutdown and awake from sleep after a varying periods of time that machine would turn "on" and stay black.

Took it back to Apple store, which was a blow to my fragile ego (frist time in 20 years of Macs that I couldn't resolve a Mac problem), and after exhaustive review of many logs "Genius Bar" guy decided it is probably a defective power source.

He has ordered one and we will see.

Back on my "tiny" 17" Powerbook that I promised my new wife I would sell :-)

Thanks for trying, all of us!

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • My Expert answered my question promptly and he resolved the issue totally. This is a great service. I am so glad I found it I will definitely use the service again if needed. One Happy Customer New York
< Last | Next >
  • My Expert answered my question promptly and he resolved the issue totally. This is a great service. I am so glad I found it I will definitely use the service again if needed. One Happy Customer New York
  • I am very happy with my very fast response. Eric is very knowledgeable in the subject area. Thank you! RP Austin, TX
  • Hi John, Thank you for your expertise and, more important, for your kindness because they make me, almost, look forward to my next computer problem. After the next problem comes, I'll be delighted to correspond again with you. I'm told that I excel at programing. But system administration has never been one of my talents. So it's great to have an expert to rely on when the computer decides to stump me. God bless, Bill Bill M. Schenectady, New York
  • The Expert answered my Mac question and was patient. He answered in a thorough and timely manner, keeping the response on a level that could understand. Thank you! Frank Canada
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
 
 
 

Meet The Experts:

 
 
 
  • Andy

    Computer Consultant

    Satisfied Customers:

    5311
    11yr exp, Comp Engg, Internet expert, Web developer, SEO
< Last | Next >
  • http://ww2.justanswer.com/uploads/EN/Engineer1010/2012-6-9_132423_jaj12a.64x64.jpg Andy's Avatar

    Andy

    Computer Consultant

    Satisfied Customers:

    5311
    11yr exp, Comp Engg, Internet expert, Web developer, SEO
  • http://ww2.justanswer.com/uploads/BA/barrenrock/2011-10-19_215925_JamesJAFinal.64x64.jpg James's Avatar

    James

    Sr. Computer Support Expert

    Satisfied Customers:

    8376
    20 years of experience building, fixing and servicing PCs and operating systems.
  • http://ww2.justanswer.com/uploads/zeyank/2009-09-26_154244_P8110079.png Ryan H.'s Avatar

    Ryan H.

    Computer Support Specialist

    Satisfied Customers:

    1741
    A+ Certified Technician - 10 Years experience working with all types of computer systems.
  • http://ww2.justanswer.com/uploads/JA/jadedangel57/2011-11-8_193134_janenewsm.64x64.jpg Jane Lefler's Avatar

    Jane Lefler

    Sr Prog Analyst / Technician

    Satisfied Customers:

    0
    Computer Programmer / Technician/ Consultant 16+ years
  • http://ww2.justanswer.com/uploads/RO/robmpreston/2013-9-23_233814_mijiFZm.64x64.jpg RPI Solutions's Avatar

    RPI Solutions

    Support Specialist

    Satisfied Customers:

    3476
    5+ Years in IT, BS in Computer Science
  • http://ww2.justanswer.com/uploads/BA/barunrath/2012-7-5_201954_Profilepic2.64x64.jpg B. Rath's Avatar

    B. Rath

    Computer Support Specialist

    Satisfied Customers:

    8671
    Certified Computer/Networking Support Specialist.
  • http://ww2.justanswer.com/uploads/FS/fszcze/2012-6-18_181848_500test.64x64.jpg Frederick S.'s Avatar

    Frederick S.

    Computer Specialist

    Satisfied Customers:

    7240
    Computer technician and founder of a home PC repair company.