Not a mac gal so.. Have a early 2011 pro. At first it was freezing on the Apple logo. Was able to get in Utilities. Erased HD and then tried to download the lion it went to online. Tried twice, it took hours both times then said cant install "something" Dont have original disc so was told to buy Snow Leopard. Put disc in through utilities startup disc, when it restarted it just makes 3 beeps. Pushed the trackpad and eject to get out the cd then it goes back to utilities. Is this a bad logic board or HD? Thanks in advance for any ideas.