I have an 27 in. imac 3.2 I3 with lion 10.7.2 - I got it as collateral for paying a friend of a friends rent and haven't heard from them in 3 months anyway I was locked out of administration so I bypassed it by option and s at startup and hopefully I won't regret I deleted the org. Administrator. I'm looking to do a completely clean install of of osx - from what I've gathered I have to install leopard from retail dvd then upgrade to snow leopard then upgrade to lion to be up to date...so I bought a retail 10.5 dvd but when I try to boot by holding c at start up or by clicking onto install icon after login I get completely lockup at at just a white screen and it won't do anything till I powerdown. If anyone can tell me why it won't let me do a clean install it would be much appreciated. Thank for help