IMac G5 no longer recognizes external hard drive

I have a Western Digital 250GB external USB drive. Yesterday, my G5 no longer recognizes it. I've restarted the computer, restarted the drive, unplugged and replugged the USB cord etc...
It's like it no longer exists ! Please help

Does the drive turn on? Is the power brick working? Have you tried plugging it into another computer or another USB port? I know you have plugged and unplugged it, but do it several times in a row. Unplug, turn it off, plug it in, turn it on and unplug etc etc, repeat the sequence several times.
BTW, is it an iMac you have, or a G5 tower?

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