OS X :: IMac Freezes On Restart

Jan 6, 2011

I have a 3.06 Intel Core 2 Duo iMac with Snow Leopard. It is completely up-to-date and has always ran beautifully. I have not installed any new programs lately. Recently, when I go to APPLE > Restart (maybe after an update or just because I like to restart my computer on occasion) the bar at the top disappears, my dock stays up on the screen, and the computer just sits there and freezes up on me. I am forced to hold down the button on the back to get my computer back. Here are the things I have tried:Re-install of the latest update using Combo Update Reset PRAM Repaired Permissions Booted from disk and ran a Repair Disk Complete zero-out of the HD, clean install of Snow Leopard, and reinstallation of everything from a Time Machine backup Nothing has worked...The other problem is that it only happens when my computer is on for several days. If I restart daily, it doesn't happen. So, it makes it hard for me to log-in as a different user for that long to initiate the problem. I think it has something to do with a program that I may open and close throughout the week but I have no way to pinpoint what program it is.

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Mar 22, 2009

Almost every other day when I start up my iMac it freezes and I have to restart it to get it working. Can anyone offer me any advice on this?

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Dec 2, 2014

my iMac random freeze and restart, on console i not see any message about kernel panic and etc system clear install ! what's happened ?   

log1  System Version: OS X 10.10.1 (14B25) 
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Jun 25, 2012

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Dec 5, 2014

Before two weeks I have done a clean install of OS Yosemite in my MBP retina. 

But unfortunately I have noticed some bugs such as: 

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- Its a grey screen when I switch on from sleep

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- The continuity doesn't work with my iPhone 6+.

- I don't know but I think that Mavericks were faster.. 

I have done PRAM and SMC reset but nothing. 

Info:
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Jun 12, 2009

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Jan 2, 2010

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Jun 26, 2010

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Jun 20, 2012

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Sep 8, 2010

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May 20, 2010

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Jun 30, 2010

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Apr 11, 2012

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Apr 8, 2009

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Apr 8, 2008

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May 11, 2012

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Apr 16, 2012

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Jun 30, 2012

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Nov 5, 2009

I recently had a hard drive failure in my imac which i replaced with the the samsung drive listed below and a fresh install of snow leopard. Now i am experiencing a problem when waking my mac from sleep. about 50% of the time when it wakes it will immediately freeze which can only be resolved by a reboot. Could this be caused by this new drive being a "green" drive that conserves more energy when asleep by going into a slower state than a typical drive or is this a software issue?

imac
2 ghz
4 g ram
Hard Drive
SAMSUNG HD154UI
1.5 t

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Aug 6, 2010

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Mar 23, 2012

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Info:
iMac, Mac OS X (10.7.3)

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Sep 23, 2009

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