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iMac 2011 slow boot with white screen

Hi,

I have a EMC2428 and have been having troubles with the boot for some time now. When booting, the iMac chimes then stays on a white screen for a while before completing the boot. This takes anywhere between 5-10 minutes. Once the boot is complete the iMac works as normal and has no problems other than broken Bluetooth (upgrade to Maverics broke it). I have reverted it back to Mountain Lion, checked start up disk, reset PRAM and SMC, and also checked HDD and permissions. No advice I have found online has been of any use. This iMac worked fine until I upgraded it to mavericks when it was first released. Can anyone help me?

iMac, OS X Mountain Lion (10.8)

Posted on May 1, 2016 1:01 AM

Reply
5 replies

May 1, 2016 4:45 AM in response to TrentJay

Do you have a backup? If not make one first in case your hard disk is failing.

In System Preferences - Startup Disk is your hard disk selected as the start up disk?

Try a safe boot Try safe mode if your Mac doesn't finish starting up - Apple Support

Reset he SMC Reset the System Management Controller (SMC) on your Mac - Apple Support

Restart into Utilities (Command-R) and run Disk Utility to repair the hard drive, not the permissions.

May 14, 2016 2:33 AM in response to SeaPapp

Sorry for the late reply, I have been flat out with university the past two weeks. This is on a fresh install.


EtreCheck version: 2.9.12 (265)

Report generated 2016-05-14 19:25:51

Download EtreCheck from https://etrecheck.com

Runtime 1:12

Performance: Excellent


Click the [Support] links for help with non-Apple products.

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


Problem: Other problem

Description:

Very slow boot, long white screen for five minutes.


Hardware Information:

iMac (21.5-inch, Mid 2011)

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

iMac - model: iMac12,1

1 2.5 GHz Intel Core i5 CPU: 4-core

4 GB RAM

BANK 0/DIMM0

2 GB DDR3 1333 MHz ok

BANK 1/DIMM0

2 GB DDR3 1333 MHz ok

BANK 0/DIMM1

Empty

BANK 1/DIMM1

Empty

Bluetooth: Old - Handoff/Airdrop2 not supported

Wireless: Unknown

Video Information:

AMD Radeon HD 6750M - VRAM: 512 MB

iMac 1920 x 1080


System Software:

OS X Mountain Lion 10.8.5 (12F45) - Time since boot: less than an hour


Disk Information:

ST3500418AS disk0 : (500.11 GB) (Rotational)

disk0s1 (disk0s1) <not mounted> : 210 MB

Macintosh HDD (disk0s2) / : 499.25 GB (489.84 GB free)

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


OPTIARC DVD RW AD-5690H ()


USB Information:

Apple Internal Memory Card Reader

Apple Computer, Inc. IR Receiver

Apple Inc. BRCM2046 Hub

Apple Inc. FaceTime HD Camera (Built-in)


Thunderbolt Information:

Apple Inc. thunderbolt_bus


Gatekeeper:

Mac App Store and identified developers


System Launch Agents:

[not loaded] 3 Apple tasks

[loaded] 117 Apple tasks

[running] 22 Apple tasks


System Launch Daemons:

[not loaded] 58 Apple tasks

[loaded] 127 Apple tasks

[running] 49 Apple tasks


User Launch Agents:

[loaded] com.google.keystone.agent.plist (2016-05-14) [Support]



Other Apps:

[running] [0x0-0x32032].com.google.Chrome

[running] [0x0-0x43043].com.etresoft.EtreCheck

[loaded] 347 Apple tasks

[running] 140 Apple tasks


Internet Plug-ins:

QuickTime Plugin: 7.7.1 (2016-05-14)

JavaAppletPlugin: 14.6.0 - SDK 10.8 (2016-05-14) Check version


3rd Party Preference Panes:

None


Time Machine:

Time Machine not configured!


Top Processes by CPU:

2% fontd

2% WindowServer

1% Dock

0% Google Chrome Helper(4)

0% mdworker(2)


Top Processes by Memory:

377 MB Google Chrome Helper(4)

274 MB WebProcess

139 MB Google Chrome

135 MB mds

86 MB Safari


Virtual Memory Information:

1.06 GB Free RAM

2.93 GB Used RAM

0 B Swap Used


Diagnostics Information:

May 14, 2016, 07:07:52 PM Self test - passed

iMac 2011 slow boot with white screen

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