type in reset-nvram
YOU MUST DO THAT IN OPEN FIRMWARE MODE
Here try this:
pico runfsck.sh
type this:
i=1;
while [ 1 == 1 ]; do fsck -fy; echo "running"; done
then press Control+O, Enter, Control+X - to save it, make sure it saves, and exit
next type in chmod u=rxwx,o=rxwx,g=rxwx...