I finally caved and decided to "upgrade" my current 4 year old system, going from OS X 10.3.9. I put the DVD into the computer, and the grey screen appeared. NO other prompts, nothing that would encourage me to think Leopard is installing... 3 hours later....NOTHING. I shut it off, remove the DVD, re-load....3 hours later....NOTHING. Only grey screen....I am on the verge of taking the computer into the genius bar to help this non-genius install Leopard. Someone take pity and offer any advice. I am basically computer illiterate, so be kind, I don't know mac "lingo". Thanks in advance for your patience and understanding!!