Finder is not showing any external devices

I'm having problems with the Finder not seeing any external devices. First I tried to restart from a CD to run Tech Tools. Even though I held the "C" down, it kept popping out the CD and then restarting as usual instead. I gave up on that and tried to just run a backup to a Store-It drive (60 GB) hard drive by Hitachi, which connects by 2 USB connectors. Finder doesn't show it. Then to test, I tried putting in a small USB drive. Finder doesn't show it either. Any suggestions?
Thanks very much!
Satya

This is what I've tried so far:
1. Check that the USB device is connected to the appropriate jack. There is a USB jack in the back of most keyboards, but it often only works with a mouse.
2. Unplug any USB devices and wait a few moments before reconnecting them. You can often fix problems with your USB keyboard and mouse by using this method. Try restarting your computer if the malfunction persists after you reconnect the USB device.
3. Test your USB peripherals in another computer. If the problem exists in the second computer, you may need to have the device serviced or look for an updated version of the firmware that supports your USB item. Check the manufacturer's website for these updates.
4. Try different devices in the same USB port. For example, if your mouse if behaving strangely, see whether an external drive or an iPod is able to connect to the computer via that USB port.
5. Disconnect any USB hubs that you're using and connect each device one at a time to your computer. You need to troubleshoot the devices individually to find out whether the USB hub or the one of the devices is causing the problem. Be sure to test each peripheral with a working USB cable.
6. Reset the SMC
7. Reset the parameter random access memory (PRAM) and nonvolatile RAM (NVRAM) on your computer. Turn off your computer, then restart it and immediately press and hold the "Command," "Option," "P" and "R" keys on the keyboard. Release the keys after you hear the startup chime for the third time and your computer should boot normally.
I don't believe the controller is "dead" because I can still get some I/O, but no control.

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