My hdd cant be detected

i have a 320gb hdd,first it was quite well when i inserted in my laptop it is easily detected now i dont know what happen it cant be detected pls help
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  1. Hello and welcome to Tom's Hardware Forums?

    When you put the drive in, did you secure it with screws so it couldn't come loose from its connections?

  2. does it detect in the bios? if so test it with some diag tools
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