Bad port? Bad cable? Firewire woes....

greetings,
the other day my external Glyph drive went "click" and then wouldn't mount.
I removed the glyph drive from its enclosure and tested. drive wass fine, but the enclosure no longer functioned properly. no big deal, bad luck, dead enclosure, right?
was having some trouble after this with the bottom firewire port that the glyph drive was plugged into; it wouldn't mount any drives and ASP said "no information found". i zapped PRAM and did reset-nvram + reset-all open firmware resets. the bottom port recognized drives again, yay.
the next day i plugged a new and different external drive into the bottom port [using the same cable as before] and it mounted fine. left it to copy some files overnight.
this morning, woke the computer from sleep and the drive was still mounted. i unmounted the drive, then tried mounting it again. this new external drive started clicking and wouldn't mount. pulled the drive from the second enclosure to find the drive in tact but the drive's enclosure no longer functioning, same as the glyph enclosure 2 days earlier.
of course, my iMac G5 is 1 week out of warranty, else i would take it in and let apple sort it out.
any hints? any more testing i could try?
how does one test a firewire port, without killing more enclosures?
the top firewire port seems to be fine. the bottom firewire port still mounts and can copy files, etc, but i don't want to plug more drives into it until i know it's not the culprit.
any help greatly appreciated
jeremy

If you are literally one week out of warranty, and the problem started a couple of days ago, call Apple Customer Relations at 800-767-2775 and see if they will do something for you. Politeness and an eensy teensy bit of delicate whining help too

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http://img69.imageshack.us/i/20110120213916.jpg/
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