Iomega USB Hard Drive won't appear on my desktop. Please help

Hi, I purchased an Iomega desktop hardrive about 3 months ago and all has been working well.
I had no problems working it with my MacBook Pro and backed up all my files easily. I now need to get some files from my Iomega hard drive, but now when I switch it on nothing appears on the desktop.
I have restarted my Mac and the hard drive several times and still nothing. I even tried using the USB cable that came with my printer in case the cable was faulty, but still nothing.
I have not used the Iomega hard drive for over a month, so am not sure if this may have something to do with it?
Can anyone help me?
Thanks in advance

OK… does the drive appear in Disk Utility else System Profiler? Also, if you are using bus power to run the drive try plugging it into AC. Another possilbility is to place a powered USB hub inbetween the drive and yur MBP as sometime this helps.

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