Yesterday my computer had frozen for a while so I help down the power button to turn it off, however now whenever I turn on my computer it is on the grey screen for a while then the only boots up to recovery disc and when I tried to reinstall the OS my hard drive wasn't there at all. Did I lose all my information? Can I get it back? I'm not too sure what to do from here. I hope that all made sense. Thank you for the help in advanced.