Can not get external hard drives to connect to my computer 17" Mac book Pro 10.7.5

can not get external hard drives to connect to my computer I am using a 17" Mac book Pro 10.7.5.
I have 2 iomegas and 1 LaCie. Changed cables. I can feel the external hard drives running and
I can hear them running but I can not get them on the computer any more. They did work at one time.
Can any one PLEASE help?

Nothing appear on my desktop.
I did Repair and Verify the HDDs in Disk Utility>First Aid from the
Utilites App about a dozen times ans they all said everything was good
except for the last time there were erors found and I ran the
Disk Utility from the Start Up Disk and the repairs were made and everything
was subposed to te good and still Nothing on the desk top.
Ginger

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Can not get external hard drives to connect to my computer 17" Mac book Pro 10.7.5

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