|If its asking you to reseat the hard drive then it's not connected to the motherboard properly. |
(Do this with the laptop off, unplugged, and the battery taken out)
Turn the laptop over and unscrew the covers until you find the one that has the hard drive, its a rectangular, silver casing. Once you find this, make sure the hard drive is firmly pressed into its connections and that its not wobbly or wiggling. It should also be inside a harness of some kind, make sure that doesn't have any defects as well.
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