I bought this on in the summer of 2008, but I don't know the exact model number. I have OS X and Ubuntu 9.10 installed on it with Boot Camp, and the OS X partition has been painfully slow for quite a while (around the time I upgraded to Snow Leopard, which made me blame the OS at first). From one point on, it always took forever to delete the Trash and other things like that, and now, most of the time it won't even boot anymore. The Linux side of things works like a charm mostly, with a few minor errors and a constant warning that the harddrive "has many bad sectors" and should be replaced immediately. Now, two questions: One, can I trust Ubuntu with this assessment, and will replacing the harddrive fix all my problems? Two, does anyone know of a good guide, and most importantly, what size Torx screwdrivers do I need? Thank you in advance for any input.