It boots up until the progress bar is at about 80%, then it flashes to an empty grey screen, no login window shown, no Apple logo. 30 seconds later it reboots on its own.
Things I tried:
- reset the PRAM/NVRAM
- reset SMC
- booted with d+shift: no indication of any kind of different boot, same as normal boot
- booted with cmd+r: it doesn't boot to the recovery window, but switches to "Internet Recovery". Internet Recovery runs to 100% before switching to the grey screen
- ran Apple Hardware Test (quick and extended): no failures
- tried to boot from an "Install Sierra" USB pendrive: it recognizes the pendrive, but boots with the same behavior as a normal boot
- booted to single user mode: I can boot to Single User mode and run fsck on the different partitions. I cannot repair user permissions (thanks, Apple, for removing that functionality).
- booted with a live Linux USB-stick: it works, although I have to enter the boot option "nodmraid". However, I cannot start Xorg. I can ssh into the MacBook when booting with Linux. I also ran testdisk and recovered (at least I think so) the partition table. Both, the normal Mac partition, as well as the Recovery Partition are there.
- booting to verbose mode.
Some errors occur:
task_exceeded_footprint: failed to warn the current task...
AppleKeyStore: operation failed (pid: 45 sel: 7 ret: e00002c2....
configureInterests - nElements <= 0!Failed to configure interests I080211Controller:addSubscriptionForThisReporterFetchedOnTimer() Failed to addSubcription I080211InterfaceMonitor::configureSubscriptions() failed to add subscription
and it finally stops at
IOConsoleusers: gIOScreenLockState 3, hs 0, bs 0, now 0, sm 0x0
Any help is appreciated. Does this mean it has a dead GPU? I just found out that Apple's repair program ended in December 2016...