I have a mid 2009 MacBook Pro 13" and recently I discovered the hard drive had gone, so I bought a new one (Seagate SATA) along with a new battery. I know it is compatible with a MacBook Pro as I have done some research ha. I have successfully replaced my hard drive (not the battery yet) but when I turn it on I get a flashing folder with a question mark inside. I have followed the correct steps to stop this but none seem to work now my new hard drive is installed. When I insert the installation CD that came with the Mac and press C/Alt either nothing happens, it ejects the CD automatically or a grey screen appears with the mouse. I'm not spending £35 just for Apple to give me some support without knowing they can definitely solve my problem. I'm pretty desperate for some help as my uni course starts in a few days. Apologies if I haven't explained my problem in enough detail etc.