My macbook 2011 17.5" won't start.
I tried all options listed here https://support.apple.com/en-us/HT201255 on how to boot with different keycodes. Only single user mode seems to work everything else ends in white screen a few seconds after the apple logo. I can choose the startup disk and tried booting from a backup but that also resulted in whitescreen.
Is there anything else I can try? Maybe reset the system completely somehow?