Hardware Problem in MBP 2012 after Mojave install
I have a Mid 2012 MBP, it has been working alright since 2012 but has gotten consistently slower so I replaced my hard drive to a SSD in summer 2018 and it was working fine on OS X Lion.
When the Mojave update came up I decided to update it but unfortunately after the update my MacBook would freeze and shut down on multiple occasions and the error log would say kernel panics (similar to what was experienced before I changed my hard drive to SSD). On reboot, sometimes the flashing folder with the question mark or the no entry sign would appear; but if I leave my mac for a while and restart it later, it would work with no issues. Watching videos were an issue too as the video would freeze randomly and resume playing for a while.
I reckon a clean install of the OS Mojave in recovery mode would help so I did exactly that. Tried a couple of times, the update keeps getting stuck at around 2 minutes left. I then tried command + R to install OS X- again, the update keeps getting stuck. I looked at the error logs, it says failed to verify installesd.dmg and it would download the chunklist again and loop through the whole process again.
Going into to disk utility, my SSD was fine, but my original HD says SMART status failing. I erased my SSD, verified and repaired it just in case there were issues and tried installing the OS again but it just doesn’t work.
I tried running AHT but it says error dec400, unable to run the AHT.
Is this a hardware problem- HD cable problem? SATA cable problem? A RAM issue? Or is my SSD not working despite what disk utility says?
Any help about how to resolve this would be greatly appreciated!!!
Is this a good question?
3 Comments
I thinkI just discovered the root issue with the DEC400 error!
The issue is Apple failed to install the AHT binaries within the OS installer so when you scratch your drive fully or install a new drive the OS installer won't install the needed files for your system in the hidden recovery partition!
Here's how to fix that: Apple Hardware Test (AHT)
by Dan
The AHT binaries aren't supposed to be installed. They're loaded through Internet Recovery.
I even downgraded to Mountain Lion and confirmed that there's no .diagnostics folder present on the Recovery HD or /System/Library/CoreServices.
by Priit Eylandt
@aero_z - Thats not correct! Different series use different diagnostics the Unibody uses it and you don't need internet recovery (internet access) to use it.
by Dan