My imac won't recognize my passport for mac external drive

I just bought a WD my passport for mac external drive to back up my imac with Snow leopard OS. the passport icon doesn't show on the desktop and when I look using disk utility the external drive isn't recognized. The external drive has nothing wrong with it as I plugged it into a newer imac running 10.9.5 and it works fine on that machine. I went through the troubleshooting steps from WD and the only one left is trouble with the OS. I have updated the software and downloaded the drivers from WD and still no change. Any suggestions? thanks!

See the mount section of the first link.
Disk Unmount Using Terminal
Disk Utility – Force Mount Disk

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