OK, I've made great progress but at a cost, primarily of my time and patience. Here's the run-down:
I seemed to remember when I ordered the computer that it was wireless capable, so I checked out all of the components ahead of time(i.e., the motherboard) and remember that the Intel site said that the DX79SR had a bluetooth and wireless module included. Fortunately, JCNS packed all of those "ancillary wires" in the original package for the motherboard, so there it was right on the front: "Bluetooth/Wi-Fi module included. Hmmmm.... I wondered if this module was included in this bag of parts. I looked it up on the Interned (fortunately I still had my "old" computer up and running), and located the technical manual on the Intel site. Sure enough, there was this funny looking thing that looked like the Bluetooth/Wi-Fi module in the picture, and upon closer inspection, I saw that it had MAC addresses printed on it, so I was making headway. But I also needed a cable to hook it up. Fortunately, there were lots of cables in my now handy bag of parts, so after some easter egging, I found what i neeed. Good thing I didn't toss the parts as I had originally planned! So with all parts in hand, a screwdriver, and the factory installation instructions at the ready, I was all set.
I unhooked the computer, hauled it out, and took off the top. Well, it's a good thing I did because, lo and behold, the HDD and hard drive had completely come loose from the chassis and were banging around in the bottom of the cabinet! I thought that I heard something rattling around when I first pulled out the computer from the packaging, but I attributed it to the DVD-ROM drive. The hardware was so banged up that the mounting frame holding the SDD was bent. Since I had previously started up the computer, I figured there was no actual damage to the hardware, but I couldn't get the SDD off of its mounting frame (they used some kind of stick-um, probably for heat dissipation purposes). So I had to bend the mounting frame back into shape, and after a fashion, I was able to get it to lock down.
With that straghtened out, the installation of the wireless module was fairly straightforward. Just peel off the backing from the double sided tape, stick the module onto an empty slot at the back, and plug in the USB wire to an unused USB plug on the motherboard. I put the computer all back together, fired it up, and looked to see if I now had a wireless. It was a no go, but the I realized that I didn't have the driver. Duh-oh! So, back to the Intel website to grab the driver and get it installed. Now things are working fine. My wireless keyboard and mouse are OK, and I can get on the Internet (I'm writing this from the new rig right now).
So, if you get your rig in the state mine was in, I highly suggest that you open it up to check it out, and don't be surprised if you have to do your own wireless module installation with all the trimmings (hunt for the parts in the parts "bag" that you'll get, look up the instructions, and download the driver from Intel on to a USB stick). Better have a second computer up and on the Internet so you can get everything you need. And if you aren't comfortable working on the inside of a computer, then you may be in for trouble!
I guess I'm going to have to send JCNS a nasty gram telling them that their quality control sucks and that they owe me $11.87 for the power cord that I had to buy separately. Just to show them what a nice guy I am, I won't charge them for the 5 hours of labor that I wasted doing their job and transforming my newly purchased $2700 computer from the brick they sent me into a workable device.
I'd definetely be interested if anybody else has these kinds of problems.
Thanks for listening.
Frank.