Go Back   MacRumors Forums > Apple Hardware > Desktops > iMac

Reply
 
Thread Tools Search this Thread Display Modes
Old Nov 20, 2008, 06:43 AM   #1
tenjin
macrumors newbie
 
Join Date: Dec 2007
Crashing iMac 24" - how to diagnose

Hi,

I have an iMac 24" 3.06Ghz, about six months old.

I have started experiencing random but frequent complete system freezes.

This is what typically happens over a period of 5 minutes:

1. I get the odd app crash (often Thunderbird, but possibly only because that is always running; sometimes mail.app crashes, something Open Office etc. No pattern to it).

2. The fans start thrashing although iStat doesn't record a higher temperature than normal. That said, the top bar hangs early on in this process so I guess the temp could be spiking. The box does not feel overly hot though (for an iMac). Normal temp about 39 degrees C.

3. All app windows freeze, and I get the beach ball. Mouse still works

4. dock freezes. Mouse still works.

5. keyboard freezes. Only mouse working now.

6. have to power off

I also have a very annoying ghosting problem on the screen that has only just started happening.

I am a relatively recent switcher to Mac, and have a lot of experience administering / developing on Windows XP.

I'm happy to trawl through the logs, so could anyone give me any suggestions about what to look for, what could be wrong etc.

Thanks

D.
tenjin is offline   0 Reply With Quote
Old Nov 20, 2008, 06:46 AM   #2
Richard.John
macrumors regular
 
Join Date: Sep 2007
Location: Yurigaoka, Japan
Speak to Apple.
__________________
24 inch iMac Rev.C - 2.8GHz Intel Core 2 Extreme - 2GB RAM - 500 GB HDD
(PRODUCT) RED iPod Nano (8GB)
iPod touch (16GB)
Richard.John is offline   0 Reply With Quote
Old Nov 20, 2008, 07:35 AM   #3
rdowns
macrumors Penryn
 
rdowns's Avatar
 
Join Date: Jul 2003
If you want to poke around, launch Console.app which you'll find in your Utilities folder.
rdowns is offline   0 Reply With Quote
Old Nov 20, 2008, 08:29 AM   #4
tenjin
Thread Starter
macrumors newbie
 
Join Date: Dec 2007
Hi,

Anything particular to look for, or any particular log to focus on?

I'm happy to use console.app, but there is a lot of text in there. As a relative newb on the Mac I'm not sure what is a normal message, and what would be indicative of an error.

If, for example, my problems are indicative of a HDD problem what should I look for, and in what log?

If bad memory is the culprit, where would I look specifically, and for what?

Thanks

D.
tenjin is offline   0 Reply With Quote
Old Nov 20, 2008, 08:52 AM   #5
AdeFowler
macrumors 68020
 
AdeFowler's Avatar
 
Join Date: Aug 2004
Location: England
For some quick tips have a look at:

http://www.macworld.com/article/4432...ubleshoot.html


Disconnect all peripheral except your keyboard and mouse obviously. Your Mac should have come with a Hardware Test Disk. Run that and see what it says.
__________________
15 2012 MacBook Pro | Mac Pro 6-core | 30 ACD
64gb 3g iPad and an iPod or two
AdeFowler is offline   0 Reply With Quote
Old Nov 20, 2008, 08:14 PM   #6
tenjin
Thread Starter
macrumors newbie
 
Join Date: Dec 2007
Hi,

Thanks for your messages.

I'm exploring the possibility that it is iTunes 8.0.1 as there is a lot of web traffic about iTunes causing problems very similar to mine when downloading podcasts.

I've been trying to pull down some large Mac Developer podcasts recently...

Cheers

D.
tenjin is offline   0 Reply With Quote
Old Nov 20, 2008, 08:27 PM   #7
ChrisA
macrumors G4
 
Join Date: Jan 2006
Location: Redondo Beach, California
Quote:
Originally Posted by tenjin View Post
Hi,

Thanks for your messages.

I'm exploring the possibility that it is iTunes 8.0.1 as there is a lot of web traffic about iTunes causing problems very similar to mine when downloading podcasts.
This sounds like it's a hardware problem. If I had to bet, I'd guess and intermittent RAM failure. But I'm pretty sure it's hardware.

I think the reason yuo see it while downloading is only because downloads are a long running process. If a bit "flips" for in the kernel the machine would likley crash.
ChrisA is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Hardware > Desktops > iMac

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
iPhone: Springboard keeps crashing - How to diagnose? GIZBUG Jailbreaks and iOS Hacks 4 Feb 6, 2014 07:51 PM
iMac "crashing" on wake from sleep MrMister111 iMac 1 Jun 17, 2013 09:50 PM
Script to prevent Macbook with "Replace Soon" battery from crashing spt MacBook Pro 0 Jun 13, 2013 03:03 PM
Help me diagnose my faulty 24" LED Cinema Display tmanto02 Mac Peripherals 5 Jun 13, 2013 09:06 AM
iPad 2 crashing, "failed to load sensor values" JWSandi iPad 0 Aug 22, 2012 09:03 PM

Forum Jump

All times are GMT -5. The time now is 05:29 PM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC