Why do my external hard drives no longer show up on my desktop?

I have three external harddrives all of which are connected through different ports, all show up in finder, all show up in disk utility, but none of them will show up on my desktop. I looked at a few other posts similar to mine but the answers given to other problems have not worked. There is no way all three of my cords are causing a connection problem and I have repaired and verifyd all the drives and still nothing. Any ideas?

Are the disks self powered? Try a SMC Reset:
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.

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    SMC RESET
    Shut down the computer.
    Unplug the computer's power cord and ALL peripherals.
    Wait 15 seconds.
    Attach the computers power cable.
    Wait another 5 seconds and press the power button to turn on the computer.
    PRAM RESET
    Shut down the computer.
    Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
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    Release the keys.

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    If TM is turned on and it still doesn't show up then do a SMC reset.
    SMC RESET
    Shut down the computer.
    Unplug the computer's power cord and ALL peripherals.
    Wait 15 seconds.
    Attach the computers power cable.
    Wait another 5 seconds and press the power button to turn on the computer.
    PRAM RESET
    Shut down the computer.
    Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    Turn on the computer.
    Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
    Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    Release the keys.

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    Hi all,
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    If TM is turned on and it still doesn't show up then do a SMC reset.
    SMC RESET
    Shut down the computer.
    Unplug the computer's power cord and ALL peripherals.
    Wait 15 seconds.
    Attach the computers power cable.
    Wait another 5 seconds and press the power button to turn on the computer.
    PRAM RESET
    Shut down the computer.
    Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    Turn on the computer.
    Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
    Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    Release the keys.

  • External Hard drive not even showing up on my desktop

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    Not enough information.
    What exactly is this EHD and Which Mac OS X are you running.
    Have you ever connected an EHD to your computer before...

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    Start a finder window.  In the menubar go to Finder > Preferences > General tab > Check show HDs on desktop.
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  • External hard drive will not show up on my desktop?!?!

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  • What can I do when my USB and External Hard-Drive don't show up on the desktop?

    I've plugged my USB into my computer after a fortnight and it gives me a message to do a custom scan. I don't know how to do that. Help?
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