I've finally gotten around to upgrading the hard drive in my 2007 aluminum iMac, but a few unexpected problems have cropped up. I'm upgrading from the stock 320gb HD to a 1tb Samsung Spinpoint F3 and using 10.5.8. I reformatted the new disk as MAC Journal (extended) and installed it internally, but upon restarting with the OSX disk inserted, the HD didn't show up in the "install location" screen. At first, I chalked this up to a poor installation job, so I then got an external enclosure, put the old HD back in and tried again, but still only got the old disk as an available install location. Any idea why the OSX installer isn't recognizing the new drive (both when it's internal and externally mounted)? It works as a storage drive and, when reformatted, also works on my PC, but it won't take the OS. Thanks in advance.