My Macbook 1,1 (Family name: A1181 Model Number: MA255) harddrive is at the end of its life so I bought bought a 640GB WD6400BPVT SATTA II harddrive. When I tried to format it with disk utility I got an input/output error. So I tried different jumper combinations which didn't help. So I'm thinking I may need to buy a smaller harddrive thats less then 500GB's. So thats my first problem. I reformatted my old harddrive so I could tackle my next problem. I can't find my osx 10.4.6 discs. I can't upgrade to 10.6 because I have Final Cut Pro Studio 5.1 academic and use it a lot. I've heard this software runs terribly on osx 10.6. Mac Stores don't carry 10.4 and you can't buy it from Apple any more so I bought a Macbook OSX 10.4.9 disc set on ebay brand new (Disc 1: 2Z607-0895 MacBook Media Multilingual AHT version 3A128 Disc version 1.0)(Disc 2: 27607-0700 Common Media Multilingual, Disc version 1.0 2Z691-5975-A) When I get ready to install it says can not install on this computer. Apple care says the discs should work with my computer. So I'm thinking that I need a very specific set of discs for computer. Trouble is I don't know which ones will work with my computer and which won't. And even if I find which ones I need I don't know where I can buy a set. Please help I've spent 3 days trying to fix this. I need my Final Cut and don't have the money to buy a Macbook pro and another version of Final Cut. I appreciate your time very much.