My Mac won't mount my external HDD after installing Lion - What can I do?

My Mac won't mount my external HDD after installing Lion - What can I do?
HDD: Verbatim 3.5'' External HDD eSATA & USB 2.0 #48802
I can not find it in Disc Utilities - so I can not repair it.
I also haven't found any Driver for the HDD to do an update.
My Mac is running on the most recent updates of OS Lion.
The HDD worked before. It contains my former Time-Mashine Backups. I would like to use this drive again. It isn't very old yet.
It would be much appreciated if anyone could help.
Cheers,
Yves

OK, try restarting in Safe Mode and if that doesn't work try resetting the SMC and PRAM.
SMC RESET
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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My Mac won't mount my external HDD after installing Lion - What can I do?

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