Hi there, I have been trying to install Mavericks on my 24" imac 7.1. It just Will not start up after install. Tried from AppStore in 10.6.8 and clean install. Can only go to 'restore Osx 10.9.1' after starting up with option pressed. Specs: 2.4", 2,8 GHz, 4gb, 1tb. Who can help me out?