Missing Operating System

I am building a computer for the first time ever. I turn on the computer, the BIOS screen flashes and then a black screen appears displaying the text "Missing operating system." I am booting my Windows 7 from a flash drive, if this helps.
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  1. Hi :)

    Then go into Bios and tell it to BOOT from USB...FIRST !

    All the best Brett :)
  2. I have a ASRock Z75 Pro3 Motherboard if that helps. I cant find the option.
  3. Pilot996 said:
    I have a ASRock Z75 Pro3 Motherboard if that helps. I cant find the option.



    Hi :)

    Look for BOOT OPTIONS or BOOT ORDER... they are in there....

    All the best Brett :)
  4. I found a guide, how do I know if my mobo is UEFI or BIOS?
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