Hello everyone, I'm new to Mac, a pro at Linux and windows so I'm familiar. So this person At work told me this computer is garbage and if you get to fix it you can keep it. Only to find out its the charger cable only that is shorting out. She told me its from someone who worked at bell and she wanted me to destroy all of its contents. I did so before her eyes by going into the bios and erased it from there not knowing it would remove the os aswell. Now I've been left and right looking for a solution because the Yosemite online installer is not working anymore and I don't know what to do. How do I reinstall a Mac os? She don't own the CD neither do I. What do I do?