wd blue 500gb

My internal wd blue 500gb hdd cannot be read , but my wd blue 1 tb can be read.they r running on the same system......n my o.s r installed in 500gb hdd.....n durind the boot it displays an flashing Underscore........., i changed the power supply n even da sata also reads in the bios.......what to do ??, please help me
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  1. Best answer
    download WD utility called data Lifeguard, to test the harddrive.
    Its availble in a bootable dos version or a windows version.
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