Used Western Digital 500 GB Harddrive mounted on another MAC

It worked fine and mounted right away. I copied the files I wanted and then ejected.
The problem is that I can't get it to remount back to my computer. I've connected it to the same Firewire port, nothing.
I tried logging on, nothing.
I tried restarting, nothing.
Are there any other things I could try, short of Disk Utility/reformating the drive?

If you have not already, you should try resetting PRAM
http://support.apple.com/kb/HT1379
and if that does not help, resetting SMC (power management)
http://support.apple.com/kb/HT1543
which is basically disconnecting the iMac from power (and all cables), and then reconnecting it, following a precise procedure. That may reset your hardware.
FireWire ports are known to go out. It should be plug and play with the iMac turned ON and running, but something like a short in the cable or connection can make the port go bad. I use a FireWire hub for anything I connect and disconnect often, and leave cables connected (while the Mac is turned on) in the direct FireWire ports.
If your iMac model as two ports, you should check the other one. If the drive is FireWire 400 and the other port is 800, you can use a cable like this
http://eshop.macsales.com/item/Newer%20Technology/1394B96036/
or an adapter
http://eshop.macsales.com/item/Newer%20Technology/FIR1369AD/

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