I'd like to run Hardware Diagnostics on a 2011 (maybe 2012) iMac. Yosemite is installed.
Have disconnected everything except keyboard and mouse, shutdown, and tried starting up with the "D" key held down. With this option, the system boots normally....no diagnostics options.
Tried with Shift D, and system boots in safe mode.
Help, please. Thanks!
Apple Diagnostics is only for macs built after June 2013, you'll use the Apple Hardware Test. It sounds like you've erased the hard drive at dome point and AHT is no longer available that way. Try holding Option-D before the gray screen appears to access AHT over the internet.
What kind of problem are you having that requires AHT?
You can use the Apple Hardware Test over the Internet. It uses the Option + D key to start it up.
Yom
Thanks for the reply, Mike.
The disk has never been erased to my knowledge, although OSX has been updated with each new release. Perhaps an old DVD with Snow Leopard might have the AHT utility? But will it still run under Yosemite? Is it safe to give it a try?
We're having 2 problems, and was hoping AHT could help rule out a hardware problem. Our primary problem is that Logic Pro (up to date version) intermittently stops and gives a message that the system is too slow. This severely impacts our ability to use the product during recording sessions. Another problem is that we intermittently get a flashing pink and green checkerboard of pixels ...sometimes about 1 inch square, and sometimes as large as 6 inches square (GPU?) (This issue doesn't seem to be creating any file corruption, to the best of our knowledge.)
The iMac is a 27 inch model 11,3. We have 8GB of memory, which, when looking at Activity Monitor, usually indicates only 6.5 GB are being used. Disk utility hasn't revealed any disk problems. (A similar system is using about 7.8 GB, and has no similar problems with Logic). Disk is about 66% full.
If we could rule out hardware issues, we'd try to reinstall Logic Pro, and, perhaps, Yosemite.
Thanks for your help!
Yes! Absolutely use disc two of your original install set. I was under the impression that your model shipped with Lion and didn't have discs. AHT will work regardless of the OS version.
THe graphics issue does sound like hardware but as I don't use Logic I can't help there. If you get an error after running AHT in extended mode post it here and hopefully we can shed some light on it.
Running hardware diagnostics with Yosemite on iMac
