Hard drive is not recognized

i just recently have made the pc to mac switch and am now in the process of transfering all of my music and what have you. i didn't get very far due to the external hard drive that i use is not recognized by the mac. ive had friends plug it into their macbooks without a problem, and it still works with the pc. so im wondering if anyone may know the proper diagnosis for such an ailment?

Ah I see, probably because it's an older version and does not run on a Intel iMac.
Check out your finder preferences to see if you have hard disk checked to be visible on desktop: Finder>preferences, general tab.
How do you connect your external drive to your iMac> firewire or USB2?
For example have you tried a different USB port? Maybe your port or ports not giving as much power as required to operate the device. Is the hard-disk self powered?
Try a different cable.
Also what make and model is your external drive, someone might help if there is an issue with particular drives that are not mounting.

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