Can't open DMGs with 10.4.6

Hello world,
After installing 10.4.6 update via the web on May 12th 2006, I have lost the ability to open DMG files. New dmgs as well as tried and true ones that I have opened with great success previously. I'm also concerned that previously used flash drives are no longer seen via the USB ports.
Trying to open a DMG gives a "device not configured" error and never mounts. I thought that I would use a third party utility to mount the dmgs, but, alas, the software was downloaded in dmg format.
The flash drive issue is that they no longer mount. These drives, like the dmgs, are ones that I've used before with no trouble.
Anyone else have these problems and, more importantly, does anyone have a solution? Any help/ thoughts/gifts of cash would be most graciously appreciated.
G5 Dual 2Ghz   Mac OS X (10.4.6)  

Hi, Deadline.
You're not anywhere near the point where I'd recommend an Archive and Install. That's one of the "solutions of last resort" and isn't the kind of recommendation one should provide out of the gate.
Let's try the following:
1. Rule out some common troublemakers: Run the procedure specified in my "Resolving Disk, Permission, and Cache Corruption" FAQ. Perform the steps therein in the order specified.
2. Let's see if Console can tell us more: Immediately after the problem occurs check the ends of these Console logs for clues.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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