just installed mountain lion on my iMac early 2008 (downloaded from App Store)
I'm trying to run apple hardware test by pressing "D" or "ALT + D" but nothing happens...
To activate the Apple Hardware test you must restart your iMac and hold Option key + "D" before the Apple Chimes.
I tried that, with no luck.
The iMac is normally loading, ignoring the diagnostic command...
You may also like to view this link...https://discussions.apple.com/message/16755758#16755758
yeah, I tried all that stuff...
the strange thing is I don't even get the message "Apple Hardware Test does not support this machine"
That only works on a Mac that's capable of Internet Recovery, which a 2008 iMac is not.
Appears you got bit by ML which seems to blow away the AHT. See my solution at https://discussions.apple.com/message/20014699#20014699 on how to restore it and get CMD+D to work on your machine.
@ baltwo: this won't work for me since I don't have disk 2 (everything downloaded from App Store);
@Linc Davis: I begin to think you're right...
my iMac early 2008
That machine came with two install discs, #1 for the OS and #2 for additional installs and AHT.. Nothing to do with MAS or ML.
based on this article: http://support.apple.com/kb/HT1883 my iMac (24-inch, Early 2008) needs 3A139 AHT.
baltwo: I've never had install discs, so my question is: where can I download it?
You can't. Call AppleCare and request replacement discs. They're available for a nominal S&H charge.
thanks for your time, baltwo
I've tried to run the AHT by holding down D, D+cmd, D+option... none of them activates de AHT. I have Mountain Lion and a fan that runs loudly all the time
Retrieving data ...