Hi all, I'm afraid I'm new to Macs, so I may just be dumb, but I have spent about 8 hours so far trying to install OS X. I bought a sencond hand Intel Core 2 Duo MacBook which came with OS discs etc. but everything was password protected and I couldn't do anything with it. I formatted the hard drive (this was the main mistake I think). Now when I put the OS X 10.4.10 disc in and hold down the alt/option button I see a picture of a disc on the screen, with Mac OS X etc written under it and an arrow pointing up. I click on the arrow and the machine just reboots. I just saw that holding down 'D' while powering up runs diagnostics. When I do this it says it's not for this machine. Have I been done? And given the wrong discs for this machine? If so is there a workaround? I really appreciate any help, as I have spent a lot of money on this. Thanks in advance.