I feel that I should reply to my own post to let everyone know what I learned, even though it is a bit embarrassing

First off, devilhood, thanks for the reply regarding your installation method. That helped me to eliminate a lot a variables.
Using that information, I carefully went through the installation using 1) an installation DVD of unknown origin that installs 10.4.5 and 2) the JaS 10.4.8 AMD Intel SSE2 SSE3 installation DVD.
First, I downloaded the PPF file that updates the JaS 10.4.8 image (ppf 1) from Demonoid. I applied that ppf to the 10.4.8 image, then burned the DVD.
Next, I booted my laptop using the 10.4.5 DVD (I did this because I read elsewhere that maybe the Diskutilty included with JaS's DVD may be corrupt. (I don't think it is corrupt after one applies the PPF, but whatever.)
I used the 10.4.5 diskutility from the intallation DVD to create 3 partitions on my USB 2.0 removeable hard drive: 2 of them I made into "MacOS Extended (journaled)" partitions, and one I made into a FAT32 partition. All three of the partitions were left at 'PC file system' under options.
Then I restarted (without installing 10.4.5) and booted up using the JaS 10.4.8 DVD. Here's the embarrassing part:
I had installed maybe a dozen times before and kept having the aforementioned display problems. This time, I noticed that those little tiny triangles next to the installation options (for example, the one next to 'Support for most common hardware') could be clicked on to reveal the individual choices under that heading!!! I didn't know that!! I attribute that to having never had a Mac - I just thought it was a 'bullet' or placeholder. I did not know you could click on it to reveal the choices underneath it! I admit this only in hopes that it may help some other poor soul out there.
Well, once I figured that out, I was thrilled! I UNCHECKED every video related kext EXCEPT the nVidia drivers and Titan. I basically made certain that the JaS DVD was only installing support for the hardware in my machine. I let it go through the install and BOOM when it rebooted, I had a screen with QE/CI supported!! (but the real joy was that the screen was 'right side up', that is, it was correct! It seems that if one does not 'uncheck' the drivers for ALL those other video cards then the install kinda freaks out our Inspiron 9400.
So - next I had to fix networking.
The link in the devilhood guide to the 10.4.6 IONetworkingFamily.kext no longer points to a place where I could d/l that kext. So I installed that 10.4.5 DVD that I mentioned previously onto the second Mac partition that I created. While its video was nice (at 1920x1200), it did not have the QE/CI support. What that install DID have was a working ethernet (Broadcom 440x) AND WIRELESS (Dell 1390 found as an Airport Card) setup.
Note that since I installed these two versions on an external USB drive, all I had to do in order to switch between them is to reboot, hit F12 during the post, and then choose 'USB device'. Then Darwin would start up and give me 10 seconds to press any button for boot options - after I did that, Darwin would give me the choice of booting to my 10.4.8 install or my 10.4.5 install (I actually named the partitions after the version they were going to hold).
So I rebooted into 10.4.8, from there I could 'see' the drive that had my 10.4.5 install, and I copied the IONetworkingFamily.kext, the IO80211Family.Kext and the IOBluetoothFamily.kext from the /System/Library/Extensions folder on 10.4.5 to the same folder on 10.4.8. It required, of course, authentication to overwrite. Then, since I am a newbie (and an average typer at best), I used the handy little script described here:
Permissions Scriptand repaired the permissions.
Then, since my IONetworkingFamily.kext came from a 10.4.5 install, I had to do the 'en0 - en1 swap' trick:
To elaborate on that, for the newbies such as myself, I:
1) Using the finder, I copied the file: "/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist" to the desktop. I copied it there because otherwise I could not edit it using textedit. Next,
2) I opened it with textedit, and "cut" everything from about line #7 and ending at about line #26 (starting with <dict> and ending with </dict>
3) Now in the file I was editing, I found a line <string>en1</string>, which I changed to <string>en0</string>. I also changed the number 1 to 0 in the line under <key>IOInterfaceUnit</key>
4) Then, I found the "</dict> line on about line 26 of the file and PASTED that which I had CUT earlier.
5) I changed its "en0" to "en1", and I changed its Integer from 0 to 1 under "IOInterfaceUnit".
Then I ran that handy permissions script again, and rebooted.
I had to run the network configuration thing from 'System Preferences' after reboot, but as soon as I went to start it up, it put up a window to tell me that it had found a new Airport Device, and told me to configure it. Whoo Hoo! Dell 1390 (aka Broadcom 4311 aka 14e4,4311) was now working!
Lastly, having read devilhood's post regarding the breakthrough with the STAC 9200 sound, I went and downloaded the AppleHDAPatcher from
Thank you SO much, Taruga!and I downloaded a STAC9200 dump from here:
STAC 9200 Dump Repository (Thank you SN8K!!)(I just used the one entitled Stac9200.txt, since I didn't know about all the other dumps there.)
And so now I have Mac OSX v10.4.8 on my Dell Inspiron 9400 with a 17" screen and a GeForce GO 7800 with working wireless and sound. How cool!! Now then, bittorrent, here I come! Let's see what I can do with this thing!!
Thanks to this community for all the help it provides. This proved to be an incredibly fun challenge (and I do mean challenge)! I ended up tooling around in linux for the first time ever as a result of this project, and never would have guessed that OSX (seemingly) is so closely related to linux.
Hope this helps some newbie out there.
Craigolio