I have a 13" non-retina 2012 MacBook Pro and I was trying to run Apple Hardware Test, however when started it up and selected the language it displayed "error code DEC400". And that it couldn't run Apple Diagnostics. Any help please would be much appreciated. Also I thought previously that Macs before 2013 ran Apple Hardware Test not diagnostics??
Thanks
MacBook Pro, macOS Sierra (10.12.6), Mid 2012
Yes your 2012 should have the AHT. Did you restart holding the D key, for on your Mac AHT ?
That error code is a general failure code of no value.
If you have internet connection try holding the option key + the D key on reboot— to connect with Apple servers.
How to use Apple Diagnostics on your Mac - Apple Support
Are you having a problem?
In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test
https://www.apple.com/retail/geniusbar/
iOS online Genius Bar appointment:
https://itunes.apple.com/us/app/apple-support/id1130498044?mt=8
Yes your 2012 should have the AHT. Did you restart holding the D key, for on your Mac AHT ?
That error code is a general failure code of no value.
If you have internet connection try holding the option key + the D key on reboot— to connect with Apple servers.
How to use Apple Diagnostics on your Mac - Apple Support
Are you having a problem?
In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test
https://www.apple.com/retail/geniusbar/
iOS online Genius Bar appointment:
https://itunes.apple.com/us/app/apple-support/id1130498044?mt=8
Apple diagnostics error code DEC400
