New iMac won't recognize external drive

My Buffalo external drive won't show up on my new iMac (neither on the screen nor in Disk Utility. The only difference from when it was working before on my old iMac is the new firewire connection.

What kind of cable are you using, if it has a FW400 to FW800 adapter that is probably your problem. If the EHD only has FW on it and no FW 800 then I'd recommend a cable like this one. You can probably pick one up at your local computer store, Radio Shack or of course Amazon. You can also try doing a SMC reset.
*SMC RESET*
• Shut down the computer.
• Unplug the computer's power cord and all peripherals.
• Press and hold the power button for 5 seconds.
• Release the power button.
• Attach the computers power cable.
• 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.

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    {---------- Please click the "Thumbs Up" to say thanks for helping.
    Please click "Accept As Solution" if my help has solved your problem. ----------}
    This is a user supported forum. I am a volunteer and I do not work for HP.

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