7
votes
9answers
24k views

Why is Apple hardware test (AHT) not loading when pressing key D on system start?

I purchased a Late-2011 MacBook Pro 15" used a month ago. At the time of purchase, I successfully ran the Apple Hardware Test. I've since installed a new SSD and aftermarket RAM. The computer appears ...
2
votes
1answer
887 views

How can I run a hardware test in lion?

My Mac was shipped with Lion. Therefore I have no install CDs that I could use to run a hardware test. How can I run a hardware test?