Why does my macbook always shut down on recovery? Hi am trying to fix a MacBook Unibody Model A1342,

The macbook has an unknown error that might also be caused by water accident or drop or just internal problems. (I dont know about the macbooks history)

i try to describe everything detailled:

normal startup ends on blinking folder with "?"
    shutdown after this is only possible with long press on power button
        restart after this is only posiible after PRAM reset
AHT test ends without errors
Internet recovery starts
    sees Wifi networks
        doesn't connect after correct Wifi-Key
            works with ethernet
                loads all data (progress bar)
                    starts until i see grey "fabric" background for a very short time and then the system suddenly shuts down.
all this is reproduce-able


Tried second hard-drive and got this error:


Does anybody have any suggestions?
Boot the Mac from a known-good local OS.

You can install an OS on to USB drives (HDD, SSD, flash) or even set up a local net boot server, but you'll need to get logs of how far into the boot process the computer gets to diagnose what subsystem is failing.

A hardware technician might remove all of the components that are not needed to boot the system and ensure that the RAM and logic board are working, but I wouldn't recommend starting hardware diagnosis before you've finished the software analysis and brought a known good OS of a proper version for your Mac to the suspect hardware.