Even though my laptop is reaching it's last years, I would like to extend it's life a bit longer because right now I can't afford a new one I was thinking about formatting/deleting the whole thing and starting from the scratch...would that help? The problem is, the MacBook doesn't have a CD/DVD reader anymore (oops!) so my question is...Can I re-install the OSX from an external hard disk? How do I re-install the operative system? I have never formatted/deleted my MacBook so any tips for this would be appreciated! Thanks a lot!