Currently Being ModeratedDec 18, 2012 2:39 PM (in response to kin sing stephen)
With the older Mac's the AHT (Applpe Hardware Test) was included on one of the 2 system disc that came with the system. I may of also been install with that older version of OS X and removed when you upgrade to Snow Leopard. So dig out those original system disc and insert one and hold down the D key. If that one doesn't get you the AHT try the other.
Currently Being ModeratedDec 18, 2012 2:41 PM (in response to kin sing stephen)
How to run hardware diagnostics for an Intel Mac
Boot from your original OS X Installer Disc One that came with your computer. After the chime press and hold down the "D" key until the diagnostic screen appears. Run the extended tests for a minimum of two or three hours. If any error messages appear note them down as you will need to report them to the service tech when you take the computer in for repair.
Some "common" error indicators:
SNS - sensor error
MEM - memory error
HDD - hard disk drive error
MOT - fan error
If this doesn't work then try:
Currently Being ModeratedDec 18, 2012 2:45 PM (in response to Kappy)
Thank you very much for the information. I have tried to initiate test by pressing the 'D' but it does not work for me. Is there any other way to do that. Is it because I installed snow leapord so I lost this option?
Currently Being ModeratedDec 18, 2012 2:47 PM (in response to kin sing stephen)
Are you inserting the original OS X Installer disc in the DVD drive. Sorry but you have not siad yes or no to that.
Just holding down the D key on older Macs will not bring up the AHT.
Currently Being ModeratedDec 18, 2012 2:51 PM (in response to kin sing stephen)
And, this was done booting from your original installer DVD (not your Snow Leopard DVD?) Did you try any of the suggestions in the other links, for example, the second and third links?
Currently Being ModeratedDec 18, 2012 3:32 PM (in response to Kappy)
I was doing exactly the same thing with my original DVD. But none of them work. That's why I am wondering if by installing snow leapord make me lose hardware diagnostic test or I have to do the other way in order to bring the test up instead of holding down the 'D' key
Currently Being ModeratedOct 26, 2013 8:18 AM (in response to kin sing stephen)
My iMac is mid 2007, I have same issue. Place D key does not work. I followed Kappy's instruction and boot from 10.5 installation disk 1 and I am able to get AHT.
Here is what i did:
1. Boot from 10.5 installation disk 1 and assign disk 1 as startup disk.
2. Reboot iMac
3. Press and hold D key and AHT show up.
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