533      iPhone_iPad_Mac_apple

iMac 27" Mid 2011

I'm having this bizarre issue with my iMac, which has a 2.7 GHz Core i5, 12GB of RAM (originally 4GB), a 1TB hard drive and an AMD Radeon HD 6770M graphics card with 512MB of video memory.

This machine has gotten slow over the years, so when High Sierra came out a couple weeks ago, I downloaded it and created a bootable installer on a USB flash drive. I then reformatted the hard drive as an APFS volume (it was originally HFS+) and performed a fresh install of High Sierra. The computer seemed to perform a bit faster. However...

When I tried turning on the iMac today, it seemed to start up like normal; the SuperDrive sought, the startup chime played and the gray Apple screen appeared. However, midway through the startup sequence, the progress bar slowed down drastically, and a moment later, the hard drive stopped spinning! Then, some time later, the HD started up again, then stopped. The progress bar kept filling in slowly, until it got stuck fully filled in. It was stuck like this for half an hour. This is the second time it's happened to me.

So I held down the power button for 5 seconds to turn off the computer, reset the SMC and now it started up normally! But it's still a little slow after the reformat. I think it's because of age, since this machine is nearly 6 years old.

What do you think is causing this?

Try booting into Safe mode Use safe mode to isolate issues with your Mac - Apple Support Then just restart normally

Download and run Etrecheck.  Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here in the ASC and recommended by Apple Support  to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.

Okay, so I booted into Safe Mode, and no issues happened. I then restarted normally, and the computer started up just fine.

Here are my EtreCheck results:

EtreCheck version: 3.4.6 (460)

Report generated 2017-10-14 15:40:19

Download EtreCheck from https://etrecheck.com

Runtime: 2:55

Performance: Excellent

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

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

Problem: Computer is too slow

Hardware Information: ⓘ

    iMac (27-inch, Mid 2011)

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

    iMac - model: iMac12,2

    1 2.7 GHz Intel Core i5 (i5-2500S) CPU: 4-core

    12 GB RAM Upgradeable - [Instructions]

        BANK 0/DIMM0

            2 GB DDR3 1333 MHz ok

        BANK 1/DIMM0

            2 GB DDR3 1333 MHz ok

        BANK 0/DIMM1

            4 GB DDR3 1333 MHz ok

        BANK 1/DIMM1

            4 GB DDR3 1333 MHz ok

    Handoff/Airdrop2: not supported

    Wireless:  en1: 802.11 a/b/g/n

    iCloud Quota: 43.63 GB available

Video Information: ⓘ

    AMD Radeon HD 6770M - VRAM: 512 MB

        iMac 2560 x 1440

Disk Information: ⓘ

    ST31000528AS disk0: (1 TB) (Rotational)

    [Show SMART report]

        EFI (disk0s1 - MS-DOS FAT32) <not mounted>  [EFI]: 210 MB

        (disk0s2) <not mounted>  [APFS Container]: 1000.00 GB

    HL-DT-STDVDRW  GA32N  ()

USB Information: ⓘ

     USB20Bus

        Apple Inc. FaceTime HD Camera (Built-in)

         hub_device

             USB2.0 Hub

            Apple Inc. BRCM2046 Hub

                Apple Inc. Bluetooth USB Host Controller

     USB20Bus

         hub_device

            Apple Computer, Inc. IR Receiver

            Apple Internal Memory Card Reader

Thunderbolt Information: ⓘ

    Apple Inc. thunderbolt_bus

Virtual disks: ⓘ

    Macintosh HD (disk1s1 - APFS) /  [Startup]: 1000.00 GB (959.14 GB free)

        Physical disk: disk0s2 1000.00 GB (959.14 GB free)

    (disk1s2) <not mounted>  [Preboot]: 1000.00 GB

        Physical disk: disk0s2 1000.00 GB

    (disk1s3) <not mounted>  [Recovery]: 1000.00 GB

        Physical disk: disk0s2 1000.00 GB

    (disk1s4) /private/var/vm  [VM]: 1000.00 GB

        Physical disk: disk0s2 1000.00 GB

System Software: ⓘ

    macOS High Sierra  10.13 (17A405) - Time since boot: less than an hour

Gatekeeper: ⓘ

    Mac App Store and identified developers

System Launch Agents: ⓘ

    [not loaded]    9 Apple tasks

    [loaded]    176 Apple tasks

    [running]    103 Apple tasks

System Launch Daemons: ⓘ

    [not loaded]    36 Apple tasks

    [loaded]    183 Apple tasks

    [running]    109 Apple tasks

Launch Agents: ⓘ

    [running]    com.epson.ecrp.launcher.plist (Seiko Epson Corporation - installed 2017-09-28) [Lookup]

    [loaded]    com.epson.esua.launcher.plist (Seiko Epson Corporation - installed 2017-09-28) [Lookup]

    [running]    com.epson.eventmanager.agent.plist (Seiko Epson Corporation - installed 2017-09-28) [Lookup]

    [running]    com.epson.scannermonitor.plist (Seiko Epson Corporation - installed 2017-09-28) [Lookup]

Launch Daemons: ⓘ

    [loaded]    com.adobe.fpsaud.plist (? 2afb3af7 ebe01993 - installed 2017-09-25) [Lookup]

User Launch Agents: ⓘ

    [loaded]    com.google.keystone.agent.plist (Google, Inc. - installed 2017-10-14) [Lookup]

User Login Items: ⓘ

    iTunesHelper    Application (Apple, Inc. - installed 2017-09-27)

        (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

Internet Plug-ins: ⓘ

    FlashPlayer-10.6: 27.0.0.159 (installed 2017-10-10) [Lookup]

    QuickTime Plugin: 7.7.3 (installed 2017-09-20)

    Flash Player: 27.0.0.159 (installed 2017-10-10) [Lookup]

3rd Party Preference Panes: ⓘ

    Flash Player (installed 2017-09-25) [Lookup]

Time Machine: ⓘ

    Time Machine not configured!

Top Processes by CPU: ⓘ

         2%   WindowServer

         1%   mdworker

         1%   mdworker

         1%   Epson Scanner Monitor

         1%   kernel_task

Top Processes by Memory: ⓘ

    748 MB    kernel_task

    112 MB    photoanalysisd

    86 MB     mds_stores

    68 MB     suggestd

    65 MB     Finder

Top Processes by Network Use: ⓘ

    Input     Output    Process name

    116 KB    4 KB      mDNSResponder

    14 KB     18 KB     apsd

    7 KB      2 KB      cloudd

    3 KB      1 KB      netbiosd

    0 B       64 B      SystemUIServer

Top Processes by Energy Use: ⓘ

      4.84 WindowServer

      1.68 Epson Scanner Monitor

      0.54 EEventManager

      0.08 mDNSResponder

Virtual Memory Information: ⓘ

    9.32 GB   Available RAM

    6.68 GB   Free RAM

    2.68 GB   Used RAM

    2.64 GB   Cached files

    0 B       Swap Used

Software installs (last 30 days): ⓘ

    SD Card Formatter 5.0.0:  (installed 2017-09-27)

    EPSON Printer Driver:  (installed 2017-09-28)

    Epson Scanner ICA Driver:  (installed 2017-09-28)

    Epson Scanner Monitor:  (installed 2017-09-28)

    Epson Event Manager:  (installed 2017-09-28)

    EPSON PC-FAX Driver:  (installed 2017-09-28)

    EpsonNet Setup:  (installed 2017-09-28)

    EPSON Printer Patch:  (installed 2017-09-28)

    Epson Customer Research Participation:  (installed 2017-09-28)

    EPSON Software Updater:  (installed 2017-09-28)

    ET-4500:  (installed 2017-09-28)

    EPSON Software Updater:  (installed 2017-09-28)

    Epson Connect Printer Setup:  (installed 2017-09-28)

    EPSON Printer Driver:  (installed 2017-09-28)

    EPSON Scan PDF Extensions:  (installed 2017-09-28)

    EPSON Scan:  (installed 2017-09-28)

    Logitech Control Center:  (installed 2017-09-30)

    Oracle VM VirtualBox: 5.1.28 (installed 2017-10-02)

    Adobe Flash Player:  (installed 2017-10-04)

    Adobe Flash Player:  (installed 2017-10-10)

    Install information may not be complete.

Diagnostics Events (last 3 days for minor events): ⓘ

    2017-10-14 12:38:21    systemsoundserverd Crash [Open]

    2017-10-13 01:00:25    accountsd Crash [Open]

        Cause:        *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0]'

        terminating with uncaught exception of type NSException

        abort() called

A safe boot clears out some caches and does some repairs. If your iMac continues to start up and function normally you don't need to do anything else.

Ditto what Mike said.  There are no unusual indicators in your Etrecheck report.  Just keep using your machine and keep an eye on performce.  Good luck.

最後更新：2017-10-16 03:12:12

  上一篇： Photos app is unresponsive

  下一篇： Mac Pro 3,1 Start up Screen Issues