HT1338 I was backing up my MacBook with Time Machine on my new (correctly formatted) external hard drive.  It was going fine when my 2 yo knocked the hard drive.  Now TM said "failed" and the Mac refuses to recognize the external hard drive.  Help please?

I was backing up my MacBook with Time Machine and using my new (correctly formatted) external hard drive.  All was going well when my 2 yo knocked the disk leading to a "failure" by time machine (Latest Backup:  Failed).  Now the MacBook will not even recognize the hard drive.  I have rebooted, tried all I can think of, but no acknowledgement of the drive.  The drive itself makes noise and vibrates as if working, but nothing from the Mac.  Please help or $100 down the drain...  Thank you.

You may have already done these resets in the "tried all I can think of " portion of your post.....if not then here they are.....
PRAM
support.apple.com/kb/HT1379
SMC
support.apple.com/kb/HT3964
.....hopefully that is all that is required.....

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