Well if the external hard-disk is working fine in other laptops and "red" light blinks when you insert your USB, then might you want to give this a try..
Step 1: Go to Device Manager and Click on USB Root Hub ( Highlighted)
Step 2: Right click and go to properties.
Step 3: Click on the Power Management tab , make sure the first option is unchecked.
Step 4 : Repeat step 2 and 3 for all USB related Hub in Universal Serial Bus controller (Device Manager)
Step 5 : Insert your External hard-disk, it should read now !
Step 1: Go to Device Manager and Click on USB Root Hub ( Highlighted)
Step 3: Click on the Power Management tab , make sure the first option is unchecked.
Step 5 : Insert your External hard-disk, it should read now !
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