Hi all I bought my first imac, late 2006. After discovering that no apps work with Lion on the appstore I researched and used os x hackers technique to install Yosemite. It has graphical issues and is slow so I used os x hackers recovery to patch it. The keyboard and mouse stopped working at the log on screen so I cannot get to the desktop. I cannot wipe the drive as the imac hdd will not unmount for erasing. There is no option to reinstall either yosemite or lion on os x hackers recovery (hold alt and r at startup). I have lion and yosemite installation files on my laptop and usb however when I boot from usb on imac it just boots the broken os that's already on. Please help save an imac. THANKS!