My iMac wouldn't boot up past the Apple logo...

My iMac wouldn't boot up past the Apple logo, so I tried to boot up from the install disk. Now all I have is the icon for a folder with a ? Mark on it and it is flashing. Now I can't get my disk back out. Any suggestions?

You cna get the disk out by holding the left wired mouse button and/or the option key down on a wired (not wireless) keyboard while booting up the machine and then pressing the eject key when Startup Manager loads.
The flashing icon on the folder is the firmware can't find the bootable volume assigned to it. Could be a software or hardware problem, could be it forgot or can't find it.
If you booted with the option key held down, then if you see your OS X boot volume then select it and hold the Shift key down for Safe Mode, set System Preferences > Startup disk again.
..Step by Step to fix your Mac

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