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The above tip worked because unplugging a machine for ten minutes resets the Firewire ports. It's an obscure troubleshooting procedure for flaky Firewire devices. It will work for more than just drives, scanners and whatnot will benefit as well.
also on the same site
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I finally read the manual - the operations manual that came with my G5 PowerMac. There I was introduced to the Apple Hardware Test - a program resident on by original installation disk, found by booting from the disk with the OPTION key held down.
Although TechTool Deluxe had reported that my hardware was OK, the detailed Apple test identified a failed DIMM. A second test indicated the same DIMM as faulty. Swapping the indicated DIMM with its counterpart in the other bank saw the problem move with the DIMM in the subsequent test. Since removal of the pair, I've had no problems. My supplier has since confirmed the failed DIMM and we await replacements.
http://www.macosxhints.com/article.php? ... 7235241862