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HP 15z-db000

I bought a new hard drive, and I installed, because my laptop said “Error 301”. Now, when I start my laptop it says “BOOT DEVICE NOT FOUND” “PLEASE INSTALL AN OPERATING SYSTEM ON YOUR HARD DISK”. What do I do? Please, and thanks.

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What did you do the drive to "install" it? A blank drive is not going to be seen and will not boot.

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