Here's a little background. . . This iMac is supposed to boot to OS X, but it displays a folder with a question mark in the center during start-up (unable to locate the operating system folder); which could be easily resolved by using the install discs (which are included) to reload the operating system. However, after start-up is complete, the screen just displays several variations of horizontal and vertical lines, and nothing else. I can't even get it to respond to any keyboard commands, or eject the disc drive, etc.