Western Digital Hard Drive No Longer Recognized

I was doing a back up and tripped over the power cord. It stopped and I restarted, but now my Macbook Pro does not recognize or pick up the hard drive. (It's a MyBook). I was using the firewire and unplugged and restarted computer, etc. several times and nothing. I even switched to the USB and still no. I plugged it into a PC and it picks it up and works fine. Any suggestions to get it back recognized on my MAC?

No Disk Utility does not pick it up

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