Why doesn't my iMac recognize my external hard drive?

I updated my imac from leopard to snow leopard to lion. I plugged in MY Book external hard drive, which had been working, but now it is not recognized. I went to the disk utility but all the First Aid buttons are greyed out and I can't do anything. I can't back it up anyplace because its not recognized. What do I do??
How do I upgrade the Firmware, which is one suggestion I read in the forum?  The My Book was separated into to sections, but I also upgraded my Mac Book Pro to Lion, so it doesn't work there either. Double trouble!!

Go to finder .
Apps
You see 1 app or nothing like bootcam or idisc
put your mouse behind apps and you see hide klick whith your mouse on this and enjoy.now you see idisc and
Your computer.
Greetings Hans

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