I have a Mac Pro 2006 1.1 with a 250Gb hard drive. This worked for a long while, then developed a fault and went really unstable. I think this is because the hard drive is nearly full. The operating system will load and if I'm lucky will do simple tasks before hanging, but almost anything I need to do causes it to hang. This includes transferring stuff to the bin and trying to empty the bin. So I haven't figured how to get this hard drive working. Alternatives: 1. I tried to load Tiger from a DVD into both of a couple of extra 500Gb SATA hard drives I bought, and this loaded up to the final part when it asked for registration details, and that's where it hung. Tried all kinds of ids. and passwords - nothing worked. This was probably a DVD that came with my Mac Mini. 2. I bought a new Snow Leopard installation disc from Apple. This loads half way into a 500Gb SATA and then stops. Tried this multiple times. I need a fix for this!!!! Otherwise I have a non-working MP and I'll have to buy another. This is frustrating, since it nearly works. Anybody know any smart fixes? Tiger was the nearest thing to installing but Apple don't do it anymore. It also strikes me that if I had another MP, I could put the original working hard drive in it and get rid of a lot of the files so it would maybe run properly again. Ideas???????