BGreg
Mar 20, 2011 6:11 PM
in response to daverk48
Level 6
(17,522 points)
Mar 20, 2011 6:11 PM
in response to daverk48
Welcome to the Apple discussions.
One of the first things you can do is to hook up an external monitor to see if it exhibits the same symptoms. If yes, there's likely display adapter issues (display adapter = logic board). If no, it could be a cable problem or a display adapter problem.
The AHT was only downloadable for the first release. After that, it's only available on the OS X disks that come with the system (that you don't have). If your friends system had Applecare on it, you can download TechTool Deluxe from the Apple site. Or you can contact Apple Support to see if they still have the original OS X disks available for your friends system, for which they charge, as I recall, around $60. Otherwise, you'll need to buy TechTool Pro, which can test the hardware and do other things as well.