Hello! I have a Sony vaio laptop I bought may 2012. Runs windows 7 home premium. Turned on and vaio logo appears along with a busy signal sound and only black screen white text "operating system not found" and flashing cursor. I got into Bios with F2 - only thing odd I see is under Hard Disk Drive it says None. I'm not very good at the terminology IN BIOS and would love a little assistance! Please. Thank you!