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External Hard Drive Not Found in Finder

Update:10-11Source: network consolidation
I have an Oxford 120gb external hard drive that I am using with my PPC iMac G5. It is connected via firewire. My computer is not showing the drive on my desktop like it normally does. I have tried using a different firewire cord, using a different firewire port, etc. After booting up the drive, System Profiler indicates that the drive is there. It gives me all the information about the drive. What could be causing this, and are there any possible solutions? It's freaking me out, because I haven't backed up our digital photos in probably 5 months or so! Any help is GREATLY appreciated!
PS - I've tried restarting the drive and the computer/connectng the cord in every combination I can think of, still to no avail!

The Best Answer

The good news is that I think I'm narrowing down what my problem is. The bad news is that I've got a huge video project due next Sunday and I'm not able to transfer video from my Canon GL2 video camera to my computer!
I am now putting it together that neither firewire port is working. The reason I say this is because I've tried my external HD in both ports, using two different firewire cords. AND I have tried capturing video to my computer using two different video cameras, and on both firewire ports.
I've trashed the old quicktime receipts and installed the newest version. I'm on OSX 10.4.9. I've also done the "turn everything off, unplug everything, drink a guinness (or two), sit for 30 minutes, plug it back in, plug the power cord back in while simultaneously holding down the power button, then hitting the power button". Still nothing but the good old "maximum Speed: Up to 400 Mb/sec!"
Here's what is odd. After trying the Guinness method once, it worked. So I was finally able to start capturing video. While capturing, I hit a break in the sequence, and this somehow kicked me back off the firewire port.
My external drive is showing up in Disk Utility, and will now usually show up in system profiler, but only in profiler if the camera is not also plugged in the firewire.
ALL that to say, even if this is something that can be fixed by Mac's repair program, I'm still screwed on my project. Any other ways I could at least get the video from my GL2 onto my computer? In crisis mode...
Also, are there any details available online on how to open up an iMac to reset the SMU? Or perhaps a PRAM reset? I've never "been inside", but am more than willing to try if I had a proper walkthrough on how to do it (what to look for, etc.). I know the link in the response above talks about how to do it from outside of the Mac, but I've also heard talk of opening the case and looking for the logic board...