I inherited a Macbook from a friend, I cannot seem to factory reset it. Specs: MacBook 3,1 Mac OS X - Version 10.5.8 It's old I know, purchased in 2008. I've tried to reset it via Disk Utility, However when I attempt to "Erase" the options are grayed out and I am not able to select anything. I have used "First Aid" and verified the disk, but I am not able to Repair Disk. Please help, Thanks, Adam.