How to do a hardware test under Lion

[donli]

I just bought a used 27'' iMac. The model is Late 2009. 2.66G i5.

How to do a hardware test under Lion? I hold on 'D' when it start, but can not enter the hardware test software. I changed to a USB keyboard, it is the same.

Any suggestions?
Thanks in advance!

 

[Matthew Yohe]

Holding D only works if you have the hardware test DVD inserted.

 

[Intell]

Holding D only works if you have the hardware test DVD inserted.

Starting with Macs made in mid-2007, Apple put the hardware test in the System folder and it was acceptable while holding down D on restart. But if you wiped the hard drive and reinstalled using an OS X media that was not the reinstallation disc, this feature was removed. It is also removed for some newer Macs that have a recovery partition.

 

[donli]

Starting with Macs made in mid-2007, Apple put the hardware test in the System folder and it was acceptable while holding down D on restart. But if you wiped the hard drive and reinstalled using an OS X media that was not the reinstallation disc, this feature was removed. It is also removed for some newer Macs that have a recovery partition.

I think it is the case. Any suggestions how to do it if the hard drive is wiped.

 

[Intell]

I think it is the case. Any suggestions how to do it if the hard drive is wiped.

Use Pacifist to reinstall the diagnostics files for your machine from its reinstallation disc.