I cant plug in 2 external hard disks in macbook ?

i cant plug in 2 external hard disks in macbook ?
i have one disk 500gb and ontherwith 160 gb and my macbook just let one of them or else ehen i plug on of, its ok but 2 just appear one !
why ? help me

Are the drives buss powered or external powered? If their buss powered that could be a problem to run both that way.

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    < Edited by Host >

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    Uploaded with plasq's Skitch!
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    You may have overloaded the port, following the instructions below it should reset:
    +1. Shut down the computer.+
    +2. Disconnect all devices and all other cables, except the keyboard and mouse cable(s).+
    +3. Disconnect the computer from the power outlet and wait for 3 to 5 minutes.+
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    Launch the System Preferences application (under the Apple menu) and select the Startup Disk preference pane. Set your internal drive as the startup disk. Close the window.

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    Hi!
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