Trouble running hardware test on 07 iMac with noisy fan

Hello
I have an 07 iMac with a noisy fan- I've tried vacuuming out dust from the back but want to avoid taking it apart if possible...
I read online I should run the hardware test, but since I am running Mavericks the Apple support advice is to run the original OS X install disc and restart (holding down D or Option+D)...
Long story short I got a replacement disc from Apple (I'd lost the original) but the iMac ejects it when I restart following the process above... could it be my bluetooth keyboard? Hopefully not since I no longer have the original hardwired one... or does anyone have any other ideas for either how to get to the hardware test... or fix the fan (without a third party app just stopping it)
Thanks!

Try holding down the Option key to get the one time boot manager screen then select the AHT. Not sure as Apple moved it around on different install discs but it might be on the Applications discs and not the OS X discs.

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Read the instructions in Using Apple Hardware Test.
If your iMac shipped with discs, you must run AHT while holding the d key while starting the Mac with its grey Applications Install DVD inserted in the optical drive.
To force the Internet version of AHT to load: with two fingers hold option d while starting your iMac with a third finger.

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My 2006 iMac running Snow Leopard won't boot even after erasing and re-installing Snow Leopard. I erased and re-installed by putting the iMac in Target Disk mode and usin my MacBookPro as the host. But after numerous attempts I still can't get it to boot either from the HD or DVD drive. I just get the white screen after the wheel stops spinning. I can't get it to run Hardware Test - just get the white screen. If I use Disk Utility via my MBP it says the disk appears OK. All the Snow Leopad files appear to have been installed. What can I do?

Hi-NRG Bwoy wrote:
I erased and re-installed by putting the iMac in Target Disk mode and using my MacBookPro as the host.
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 Cheat sheet to help diagnose and fix your Mac
Perhaps you installed the wrong version OS X onto the iMac, you can't use the disk from another Mac.
clean the disk.
If it's not working then use this method to create a bootable 10.6 USB from the iMac machine specific 10.6 disk or the 10.6.3 retail disk on your other Mac, use it to boot the iMac with.
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24" iMac summer 2008. CPU fan runs at highest speed, some times goes to "sleep" mode. t' is about 35'- 42'C. Run hardware test: 4sns/1/40000000:tlop-130.000, next time 4sns/1/40000000:tlop-128.000 errors. Reinstalled all softwere. Nothing changed.

24" iMac summer 2008. CPU fan runs at highest speed, some times goes to "sleep" mode. CPU t' is about 35'- 42'C. Run hardware test: 4sns/1/40000000:tlop-130.000, next time 4sns/1/40000000:tlop-128.000 errors. Tried SMC, NVRAM, PRAM. Reinstalled all softwere. Nothing changed.

I suspect you have hardware problem with a fan sensor. Doing a software install will not help the machine needs to be taken in for service. If you run Apple Hardware Test in Extended Mode it should reveal the error code. If it does not then run AHT an additional 2-3 times to be sure in Extended Mode. Each pass will take about 30-60 minutes.

Can I run hardware test and repair a disk with Leopard using 10.3 DVD

Hi,
I'm trying to decide whether to partition and clone Leopard to my external or partition and install Tiger on the external.
My iMac came with 10.3.6 install and hardware test DVD's and they (Comp USA) gave me a Tiger drop-in DVD. I upgraded to Leopard through a family pack DVD (when I told my friend I would by one of the install's I thought I would get a DVD, but you only get an install license, oh well). By the way, Leopard runs great in my rev A iMac G5.
I'm trying to figure out which os to use on the external as a safe-boot incase something happens. If I clone Leopard onto a partition for backup/boot, can I still use the Disc Repair (not permissions) and Hardware Test from the 10.3 or Tiger DVD's to maintain that permission should something bad happen? The way I see it, i'll be able to repair permissions on both the main and external drives using Leopard's disc utility, but I'm not sure if I can repair a Leopard disk or do Hardware Test on that disc using an earlier version of OSX install/Hardware Test DVD's.
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LowBb
Message was edited by: LowBb

Yes, that seems to be the case, but I didn't do good enough research when he asked if I wanted a license for Leopard. For some reason, I had it in my mind that a Family pack came with multi DVD's for people. Maybe that's why he sold me a license so cheap. I thought I was getting a bargin, you get what you pay for.
So, I have the hardware test DVD's that came with the iMac and the Tiger drop-in is just an upgrade with no Hardware Test, you are correct.
But: (let me make sure I have this right) I should not use the 10.3 DVD's or the Tiger drop-in to repair a disc (not permissions) on a hard drive running Leopard. Is this what you are saying? I kind of thought this would be the case. If it is, I'm going to install MY stuff that I have the DVD's for on the external as an emergency boot disc.

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I am trying to figure out if I have a hardware issue and was told to run the Hardware test. my iMac is the late 2010 model and shipped with Mac OS X (10.6.4) and currently upgraded to Mountain Lion 10.8.3.
I have tried running test by restarting and pressing "D", option "D", and both ways with and without the original applications install DVD in. But every time I just get the login screen that I normally get. Am I doing something wrong?
This is above my pay grade, but I am having trouble running Adobe's Illustrator and a colleague using the same set up said they had the exact same issue and it turned out to be bad RAM. So, I am trying to run the hardware test to determine if I have a hardware or software issue.
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See this thread and baltwo's directions, which will enable you to start the AHT directly from the boot volume, that is if the AHT (.diagnostics) isn't already present.
https://discussions.apple.com/thread/4427984?start=0&tstart=0
But first, using the starting suggestion there, unhide hidden folders and see if you have .diagnostics in the given location. If you don't, then proceed with the rest of the suggestions, but be sure to use the corrected Terminal command later in the thread.
Still, disc 2 and the D key should work. Don't know why it isn't.
Also, if you just want to test the RAM, get Rember. But close all applications first. It may be necessary to run several loops before it finds anything.
http://www.kelleycomputing.net/rember/
Message was edited by: WZZZ

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I have Mac Pro late 2013, 6 cores, 16 Gb RAM, Yosemite. I have followed Apple instructions how to run hardware test. Both using D and Alt D at startup. Unplugged devices, plugged devices. The only thing I see is a row of languages and option to shut down or restart with black background I check English and hit return. After that nothing happens. Is there somone who could explain ?

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Try using Disk Utility:
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.

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Thank you for your reply, Carolyn.
I read this article. None of those applied to my case:
my Mac Pro came before 2013 and it doesn't have Apple Diagnostics built into it,
it doesn't have Apple Hardware Test built into it,
and my Mac Pro came with Mountain Lion preinstalled and it did not have system software disc or USB flash drive.
Restarting while holding down the D key simply doesn't work it just reboot back to the desktop.

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The AHT for your machine can be run from the original disc that came with the computer when it was new.
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