I have a macbook air [one with the 74.XX Gb HD.] I didn't know what i was doing but i read somewhere i had to format/erase the drive.. So what i did was... clicked on "MACINTOSH HD" and i went to "ERASE" tab in the disc utility [inside the Mac OS X install disc] then i clicked on "ERASE" on the bottom right of the window.. and now instead of "MACINTOSH HD" It says "untitled" and now when i boot up.. it wont load an Operating system. It flashes a picture of a folder and a question mark. Summarized.. In disc utility inside mac os x install cd i deleted my hard drive to install leopard, and now when i boot up it wont load an os. ALSO THE DISC WILL NOT WORK BECAUSE IT ISNT THE DISC THAT CAME WITH MACBOOK AIR [Grey disc's] and also when i boot up with a cd in superdrive.. sometimes a list will pop up saying to select... either... "install disc" or "network utility" please help me . i dont understand what to do.