I just upgraded the RAM and harddrive of my my 2009 Mac Mini, carefully following the steps in the OWC video. Im 100% sure i didnt miss anything. I installed a brand new blank 7200.4 500gb drive. I started the mini and i got a blinking question mark, then i inserted the OSX install DVD and i got the apple logo as the drive started to spin for a minute, then it just shut off and i cant turn it back on. Any ideas? Edit: i actually forgot to hold town the C key wile booting the mini..if this helps. But i cant understand why the thing wont turn on!