Iomega Hard Drive Disconnecting Problems / iMac Freezing on shutdown/restart!

I had noticed in the past week that when my iMac is in sleep mode that sometimes it is unresponsive when I try to wake it up to use it again, and then after a few minutes of trying, I have to manually power the computer on, like it randomly will shut itself down if it's in sleep mode for a longer time, but like I said, this is random.
The BIGGER problem I've encountered in the past two days is that when I go to eject my Iomega eGo Blue 1tb hard drive, the drive will not disconnect, the name on the sidebar of my finder just changes from black to grey underneath the devices row and on the desktop the Iomega icon turns lighter to indicate that it is not in use, but I cannot eject the drive, so it's still somewhat connected to the computer. I've had this drive for over a year with no complaints as I use it on both my MacBook (2009) and iMac (which I purchased new in October '11).
Instead of just turning off my hard drive or unplugging it, I try to restart my computer; however when I do that, the restart get stuck and nothing ends up working. I also have tried to shut it down with no luck, I then go to holding down the power button until it manually shuts down.
I also plugged in the hard drive to my MacBook and am not experiencing any mounting or disconnecting problems with it. I am very afraid that this may cause my Iomega to crash before I can get another hard drive to back everything up with!
I'm concerned that this could be a problem with both the hard drive and my Mac; does anyone have any input on this? I will probably end up taking it into the store or calling AppleCare, but I wanted to see if anyone else has had a similar problem.
Thank you!

First reset the SMC, you may need to do this 2-3x. Also reset the PRAM, again 2-3x. Finally restart the computer in Safe Mode to reset some of the caches, it's possible one is corrupt. When resetting the SMC & PRAM please carefully follow the instructions below:
SMC RESET
Shut down the computer.
Unplug the computer's power cord and all peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
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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