MacBook – How to do Apple Diagnostics on Macbook pro with a dead screen

I had the same issue when upgrading my RAM.
It turned out that the SO-DIMMs were not properly inserted.

Try the following:

1. take out both SO-DIMMs
2. re-insert the first one and make sure it goes fully into the lower socket
3. try rebooting
   • if it works, shut down again and insert the second SO-DIMM (again taking care to fully insert it into the upper socket.)

Good luck.

The original AHT file is somewhat hidden.

The AHT is stuffed into an AHTxx.dmg file and found on the Recovery HD volume that is also hidden.

First you have to make the hidden partitions visible

To enable the see all partitions in Disk Utility (the Debug Menu)

defaults write com.apple.DiskUtility DUDebugMenuEnabled 1

In Disk utility now there will be a tab called Debug.

Use it to show hidden partition.

You will now see the Hidden partition called Recovery and EFI.

Mount the Recovery to see the files in finder and find the AHTxx.dmg

Delete it since it does not work anyway and it is a left over.

Now you can Disable the see all partitions in Disk utility (remove the Debug from the Tabs)

defaults write com.apple.DiskUtility DUDebugMenuEnabled 0

To Show all hidden files

defaults write com.apple.finder AppleShowAllFiles TRUE && killall Finder

When done replace the TRUE with FALSE to hide hidden files.

Try the Diagnostic mode.

Since you do not have one anymore, the Internet version should come up automagicaly.