After I ran the macOS Sierra installer to start installation, my 2010 Macbook Pro wouldn't start anymore. It would get to the grey startup screen, flash the Apple logo for a second, and then switch to a crossed circle, and periodically restart that sequence.
I got into verbose mode by starting my computer with Cmd+V and saw error messages like:
efiboot loaded from device: Acpi(PNP0A03,0)/Pci(1F12)/SATA(0,0)/HD(Part3,Sig4B75...) efiboot file path: \System\Library\CoreServices\boot.efi ERROR!!! Prelinked kernel corrupted ERROR!!! Load prelinked kernel with status 0x000000000000001b Error loading kernel cache (0x1b) Error loading kernel cache (0x1b) ...
How do I get my computer back on track?