150      iPhone_iPad_Mac_apple

iMac will not boot past progress bar

i have been trying to fix my sister-in-laws 20 inch iMac (10 years old). It would start in recovery mode and everything checked out ok with disk utility. But trying to boot up normally the progress bar would get about a third of the way then stop. The hard drive had only 9% free space so I cloned it to a bigger drive. It still starts up in safe mode from the cloned drive but will not get past the progress bar on a normal boot.

As I have the original drive and a time machine backup I thought Id start with a fresh system. On reboot the voice over assistant starts telling me how to use voice over but the screen still shows the same grey Apple logo and the progress bar doesn’t go any further than normal. The fact that it boots in to recovery mode and also boots in to safe mode suggests to me that the hardware is working properly. I have zapped the NVRAM and installed a new backup battery. Is there anything in the hardware or firmware that I can reset to get over this issue? It’s almost as if the video doesn’t remember how to get past the startup screen.

If you still have the original install discs that shipped with the computer I would suggest running Apple Hardware Test in extended mode 2-3 times back to back. I suspect a HD failure.

How to use Apple Hardware Test on your Mac - Apple Support

Thanks for the suggestion. Unfortunately the original discs are no longer available. However, I have run the full suite of the latest version of tech tools pro and all the hardware has passed with flying colours. I have already replaced the hard drive. The fact that it boots in safe mode suggested to me that it must be a problem with the installed system. However a new hard drive and clean system still hasn’t resolved it. One thing I neglected to mention, if it’s significan, is there appears to be no connection to the built in speakers. Before I reset the NVRAM there was no startup chime. Then after starting in safe mode, although there was a chime, checking the sound preferences in system preferences shows no option for built in speakers. When checking the logs in console to try and determine at what stage the boot fails, there was a reference to “volume” around the time it hangs. 

Please post an EtreCheck report of your system. We can then look for obvious issues. Please click the link, download the app and run the report. Once you have the report, please copy and paste it as your reply to this post.

Sorry for the delay in replying. I have run EtreCheck but obviously I can only run it when booted in Safe Boot so I don't know how much use it will be. Please see report below:

EtreCheck version: 3.4.4 (448)

Report generated 2017-09-14 19:52:09

Download EtreCheck from https://etrecheck.com

Runtime: 2:49

Performance: Excellent

Click the [Lookup] links for more information from Apple Support Communities.

Click the [Details] links for more information about that line.

Problem: Other problem

Hardware Information: ⓘ

    iMac (20-inch, Early 2008)

    [Technical Specifications] - [User Guide] - [Warranty & Service]

    iMac - model: iMac8,1

    1 2.66 GHz Intel Core 2 Duo (Duo) CPU: 2-core

    4 GB RAM Upgradeable - [Instructions]

        BANK 0/DIMM0

            2 GB DDR2 SDRAM 800 MHz ok

        BANK 1/DIMM1

            2 GB DDR2 SDRAM 800 MHz ok

    Handoff/Airdrop2: not supported

    Wireless:  en1: 802.11 a/b/g/n

Video Information: ⓘ

    ATI Radeon HD 2600 Pro - VRAM: 256 MB

        iMac 1680 x 1050

Disk Information: ⓘ

    WDC WD1001FALS-40K1B0 disk0: (1 TB) (Rotational)

    [Show SMART report]

        (disk0s1) <not mounted>  [EFI]: 210 MB

        Macintosh HD (disk0s2 - Journaled HFS+) /  [Startup]: 999.35 GB (987.86 GB free)

        (disk0s3) <not mounted>  [Recovery]: 650 MB

USB Information: ⓘ

     EHCI Root Hub Simulation

        Apple Inc. Built-in iSight

     EHCI Root Hub Simulation

     UHCI Root Hub Simulation

        Mitsumi Electric Hub in Apple Extended USB Keyboard

            Mitsumi Electric Apple Extended USB Keyboard

        Apple Inc. BRCM2046 Hub

            Apple Inc. Bluetooth USB Host Controller

     UHCI Root Hub Simulation

     UHCI Root Hub Simulation

         composite_device

     UHCI Root Hub Simulation

        Apple Computer, Inc. IR Receiver

     UHCI Root Hub Simulation

System Software: ⓘ

    OS X Yosemite 10.10.5 (14F2511) - Time since boot: less than an hour

Gatekeeper: ⓘ

    Mac App Store and identified developers

System Launch Agents: ⓘ

    [not loaded]    4 Apple tasks

    [loaded]    157 Apple tasks

    [running]    52 Apple tasks

System Launch Daemons: ⓘ

    [failed]    com.apple.ucupdate.plist (Apple, Inc. - installed 2014-09-10)

    [failed]    com.apple.watchdogd.plist (Apple, Inc. - installed 2017-06-05)

    [not loaded]    46 Apple tasks

    [loaded]    141 Apple tasks

    [running]    72 Apple tasks

Internet Plug-ins: ⓘ

    Default Browser: 600 (installed 2015-07-17)

    QuickTime Plugin: 7.7.3 (installed 2017-09-08)

3rd Party Preference Panes: ⓘ

    None

Time Machine: ⓘ

    Time Machine not configured!

Top Processes by CPU: ⓘ

         2%   ps

         1%   mdworker

         1%   WindowServer

         1%   mds

         1%   fontd

Top Processes by Memory: ⓘ

    295 MB    com.apple.WebKit.WebContent

    275 MB    kernel_task

    132 MB    Safari

    85 MB     WindowServer

    64 MB     Finder

Top Processes by Energy Use: ⓘ

      1.62 WindowServer

      0.04 AppleSpell

      0.02 cloudphotosd

      0.02 apsd

Virtual Memory Information: ⓘ

    1.27 GB   Available RAM

    74 MB     Free RAM

    2.73 GB   Used RAM

    1.19 GB   Cached files

    2 MB      Swap Used

Diagnostics Information: ⓘ

    2017-09-14 19:45:13    com.apple.WebKit.WebContent Crash [Open]

    2017-09-14 19:39:54    Last shutdown cause: 3 - Hard shutdown

I should also add that I have a complete backup of the original hard drive along with a time machine backup. I have installed a different hard drive, initialised it and installed Yosemite on to that new drive. I have set up just one user account and have installed no additional software (other than now having installed EtreCheck) and yet the machine still fails to get past the same point of the progress bar if I try to boot normally. It boots in safe mode and boots in to recovery mode and even boots from and external hard drive. It boots from the tech Tools Pro Protogo drive I created too. With no third party software installed I can't see what would cause it fall down during startup.

最后更新：2017-09-15 03:42:57

  上一篇： Keyboard cover for magic keyboard with keypad

  下一篇： iMac as Expanded Screen with MacBook