Sorry, I must have hit new thread, was supposed to be added here: http://forums.macrumors.com/showthread.php?t=1104312 Lion is not allowing me todo a clean install on my iMac. I am attempting to downgrade to snow leopard via a clean install, but I cannot get the computer to snow leopard throu any means. 1) attempt to click image while running in lion, cannot downgrade. 2) attempt to put 2nd partition and install 10.6 from it - hangs at apple logo on reboot. 3) attempt to install from original disk on cold boot - blank white screen. 4) attempt to reboot with snow Leo disk set as boot disk - hangs at blank logo screen. Lion is resisting this downgrade, how do you suggest I do a clean install of snow Leo if it is designed to stop me from doing it? I have been searching for hours.