Mac doesn't recognize external HD anymore. Any help is appreciated.

Hi Everyone. Suddenly, my MAC mini doesn't recognize my external hard drive any more. It was fine for years and today it's not "there".
I tried connecting with different fire wire cables and still, same problem.
I also tried connecting the external HD to my iMac and still, doesn't recognize it.
I tried restarting many times, still, same problem.
I tried disconnecting all cables and power cords, reconnecting them and powering on, and that didn't resolve it.
I have been searching the web all morning for ideas and can't seem to find a solution.
The external HD is a Maxtor III 300 GB. Older one but was big enough for my needs.
I was reading that sometimes doing a software update might cause an issue with external HDs. I just don't know how to resolve that if it is.
This hard drive is formatted for the Mac.
According to Maxtor I do not need to update my drivers. I was thinking that maybe one got lost.
Any help is appreciated. Thanks in advance!
Christine

If only the mini couldn't read it, that would lead down one path. However, if both the mini and the iMac can't read it, that sort of points to an issue with the drive. Do you hear the drive power up? If you have an external power supply have you tried that or do you use that with it?
It's possible that the hard drive is in fine condition, and it's the case electronics that are acting up. You should be able to pull the hard drive out of the Maxtor case and put it into another external case, to read the hard drive, assuming the drive itself is OK.

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