External hard disc unseen

Hello, i have aspire v3-571G i-5-3210M 2.5 Gh and i have windows 7 ulti 64 bit
i have an external sata 250 mb
I have done the driver search and i have reinstalled the drivers from control panel and still i can not see my external drive in bios.. i haven't seen my external drive into another pc yet but i ve never used my hard disc since september . back then it was recognized.. i think it is something with the drives what else i can do.... Also i had gone into the acer site to checked the usb drives installed them but still nothing happened ( i do have driver genius driver max and driver cure to find any drives) so i dont know what else to do. please help me. Every time i cable my external hard disc i see the blue light but dont hear the noise from my pc.

thank you
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  1. Please see my reply to your identical post here: http://www.tomshardware.co.uk/forum/298196-14-external-hard-drive-unseen

    Please do not post twice for the same problem!
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