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05-21-2014, 06:40 AM #1
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- Nov 10, 2006
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- Leeds, England
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- 17" Core Duo Macbook Pro
OS X Mavericks Hardware DiagnosticsI've got a mid-2010 27" iMac 2.8 GHz Intel Core i5. The fan goes nuts after about an hour and it seems I need to run hardware diagnostics. Booting with d pressed doesn't work and if I get the Hardware Diagnostics running from the Internet it says it doesn't work with my iMac.
I am running 10.9.2 and have the Snow Leopard disks. Can I use these for hardware diagnostics? Or what else can I do?
Thanks.
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05-21-2014, 07:27 AM #2
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- Dec 11, 2010
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- Chicago
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- late 2012 mini w/SSD
I guess you've read this?
OS X Mountain Lion: Use Apple Diagnostics or Apple Hardware Test
For most(?) alternate startups, you hold the special key down immediately after the gong sound (not before or during), and until you see that it is starting differently. (my current Mac is a headless mini, so I don't do this test)
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05-21-2014, 07:41 AM #3
- Member Since
- Nov 10, 2006
- Location
- Leeds, England
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- 324
- Specs:
- 17" Core Duo Macbook Pro
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05-21-2014, 07:53 AM #4
- Member Since
- Dec 11, 2010
- Location
- Chicago
- Posts
- 1,727
- Specs:
- late 2012 mini w/SSD
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05-21-2014, 08:07 AM #5
- Member Since
- Nov 10, 2006
- Location
- Leeds, England
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- 324
- Specs:
- 17" Core Duo Macbook Pro
Just tried it with a USB and still the same.
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05-21-2014, 01:45 PM #6
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- Jan 23, 2008
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- Keller, Texas
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- 2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
I am running 10.9.2 and have the Snow Leopard disks. Can I use these for hardware diagnostics? Or what else can I do?
Using Apple Hardware Test on computers with OS X 10.5.5 to 10.6.8
AHT is located on the Applications Install Disc 2 and should be included with your computer or the MacBook Air Software Reinstall Drive on a MacBook Air (Late 2010). To start AHT on these computers make sure the Applications Install Disc 2 is inserted into the built-in optical drive, external Apple Superdrive, or for the MacBook Air (Late 2010) be sure the MacBook Air Software Reinstall Drive is inserted into a USB port. Please then follow steps 1-6 outlined in the "Using Apple Hardware Test on computers with OS X 10.7 or later" section of this article.
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05-22-2014, 01:48 AM #7
- Member Since
- Nov 10, 2006
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- Leeds, England
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- 324
- Specs:
- 17" Core Duo Macbook Pro
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05-22-2014, 05:14 AM #8
- Member Since
- Dec 11, 2008
- Posts
- 117
Maybe a bit of a stupid question but did you remove the DVD?
You could try installing Temperature Monitor. This makes checking the internal components temps easy. This way you could find what is over heating. Here's a link to the web site
Temperature Monitor: Description
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05-22-2014, 05:27 AM #9
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- Nov 10, 2006
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- Leeds, England
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- 324
- Specs:
- 17" Core Duo Macbook Pro
Well, I did the hardware test from the Snow Leopard disk and it came up with a fan error on the hard disk. I restarted and a progress bar came up and it took about 15 mins to boot. I then did a PRAM reset and now I've been using it for four hours and it is totally silent! No fan overuse (it normally comes on about an hour after use)
Does the hardware test actually fix anything? Could it have been the PRAM that caused the error? Or should I be worried about imminent failure of the fan?
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05-22-2014, 12:50 PM #10
- Member Since
- Jan 23, 2008
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- Keller, Texas
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- 55,287
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- 2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
Normally, a SMC reset will fix a runaway fan due to management errors (SMC) but sometimes a PRAM reset will accomplish the same thing. Looks like you may have solved it with the PRAM reset. Keep your eye on it for any future problem and don't forget to make backups.
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05-23-2014, 01:54 AM #11
- Member Since
- Nov 10, 2006
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- Leeds, England
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- 324
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- 17" Core Duo Macbook Pro
Thanks, I did SMC reset initially but it made no difference. As and when I get time I'll run the hardware test and see if it still reports a problem. I did read on the Apple forum that the fan sensor can simply report the wrong information which causes it to overrun and that it can be fixed by software only so maybe that's it!
Can anyone answer my question as to why there's a slow boot and progress bar immediately after a hardware test?
Thanks a lot.
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05-23-2014, 02:01 AM #12
- Member Since
- Jan 23, 2008
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- Keller, Texas
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- 55,287
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- 2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
Can anyone answer my question as to why there's a slow boot and progress bar immediately after a hardware test?
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05-23-2014, 02:13 AM #13
- Member Since
- Nov 10, 2006
- Location
- Leeds, England
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- 324
- Specs:
- 17" Core Duo Macbook Pro
It works anyway. Thanks everyone, lots of great support and help here.
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