Hello everyone. Alrighty, so the short of it: just swapped out/in a 250GB Hitachi HDD. (Model number HTS723225L9A360, manufactured 8/2008). When turning on the computer, it leaves me with a folder and a question mark. This happens whether I have the recovery disks, or the Tiger install disks. Holding down 'C' does not seem to want to work. Holding down 'D' does not want to take me to hardware tests, either. Anyone have any thoughts? One last detail- the old drive seems to have four prongs that the new one does not have- I'm assuming this is a power connector- could this be an issue? Thanks so much!