Hi - am new on here and have a particular problem. I bought a 13" MacBookPro in 2009 - it came with Mac OS 10.5.7 which I believe is Leopard, running on Intel Core Duo. The following year Snow Leopard came OUT and being a bit naive at the time, I allowed myself to be persuaded by a friend I could save money by downloading a torrent version of the new O.S. which he did, copied to disk and was able to get it running... Now, on using Maintenance and double-checking with Onyx, I have problems with 'volume needs repairing - load from original install disk'. Can I do this from the original MacBook Pro Leopard install disk which I have ? I am no longer in contact with this ex-friend and do not have the disk copy by which he put Snow Leopard on my machine - curse the day... Will my original Leopard disk work - or will I need to do something more radical ? I have recently bought a proper Apple Retail Snow Leopard 10.6.3 disk and wondered if I could use this to get my machine running normally ? Should I back everything up and go for a clean install or just try repairing disk permissions ? Any help and advice gratefully received !