Factory reset on iMac OS X
I was given an iMac and I was trying to factory reset because the previous owner alledgedly can’t remember her password so I can go in that way to reset everything. I searched online how to do this without a password. The instructions were to hold the power button while also holding the shift+option+command+R+P and then follow the prompts on the screen. Well did that but instead of getting options all I got is a blinking file folder with a question mark in it. Can someone help with this reset issue? Or at least give reasonable suggestions.
Thank you.