Hardware test bypassed during startup with yosemity

I have a mid 2007 20" iMac that I just rebuilt with a new 1 TB hard drive and 4GB of ram. Afterwards I upgraded to Yosemity 10.10.1. Today (3 days latter) it froze up, tried everything but had to hold power button in to shutdown. After restarting I tried doing the hardware test thats in my operator's manual holding the "D" key during power up. It was bypassed and opened straight to my desktop. Can I perform a hardware test with the new operating system?

That old AHT requires that you boot the computer from the AHT disc that came with your computer when it was new.
You might look at this article for how to get the old method back: Get Apple Hardware Test Boot Mode Back on Some OS X Lion Macs.

Similar Messages

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    If you can't eject a CD or DVD or open the drive tray
    How do I eject a defective DVD?: Apple Support Communities
    http://www.faqforge.com/macosx/how-to-eject-a-cd-in-a-mac-mini-with-pc-keyboard- and-mouse/

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    (this might well be moved to a new topic)
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    tragicallyhip:
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  • Freeze during startup if magic trackpad not available

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    Today I tried to replicate my problem and couldn't. Either by turning off the trackpad before I shut down or else while my computer was off.
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  • Apple Hardware Test error 4SNS/1/40000001:ID0R-0.000 on Retina MBP

    Getting the above error on my 3-day old retina MBP with 16gb RAM and 768GB flash storage.  I had loaded Chrome, Firefox, VMWare Fusion, Office 2011, and all the Apple updates as of 7/3/12.
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