Keyboard shortcuts:

Change lost password

hold on powerup for single user mode

at root prompt:

• mount -uw /
• sh /etc/rc
• passwd

Updating hacked machine:

turn off journaling in Disk Utility:

• select partition
• hold down option and click “file” menu
  

reboot with live CD (hold down alt key)

backup to external drive: see here

• example from above link: dd if=/dev/sdc bs=4M conv=sync,noerror | pv -s 160G | dd of=/dev/sdd bs=4M

reboot to original internal drive do update but don't restart if that is an option reboot to live CD delete platform.support.plist (mentioned here)

• perhaps this file is at System/Library/CoreServices as mentioned here

boot original internal drive profit Resources:

• http://superuser.com/questions/84446/how-to-mount-a-hfs-partition-in-ubuntu-as-read-write
  

Hide the dock by making it really small: 

defaults write com.apple.dock tilesize -int 1
killall Dock