I just wanted to follow up on the advice given here . . . and say that for the first time ever (no, really!) I decided NOT to Do As Advised By Our Esteemed Community Members.
I did rebuild the system, and I am REALLY HAPPY with how it turned out. It is worth noting, for anyone eyeing their clunkers, that it took me the better part of Saturday, Sunday, and today - but I was working with a steep learning curve inside the case.
For example, as noted by my Installing Hard Drive thread, I didn't realize cables are verrrry particular about which direction they are installed (hint: one edge is BRIGHT RED.)
Kiddo now has a (used) PII 266 motherboard, which came with its processor and chipset. It even had a newer video card than the old machine thrown in, which was a surprise. I got that for a song. I bought a new 40 gig HDD, mostly because used drives that size were the same price as new w/ rebates/markdowns - about $40 after rebate. System previously had a futzy 3.2gig drive, and the original 1.2 gig HD. (I remember several people drooling over that "big" drive when we got it, too

!!) The new (to us) MB also had 48 MB RAM onboard, but I pulled it in favor of the 80 MB in the old machine (after carefully checking that it was the same kind.)
I was happy to discover SCSI slots too, as our best machine doesn't sport any - and I have an old scanner that I occasionally NEED, but can't hang off the P4 desktop.
As noted above, I also needed a new case to fit the updated MB architecture. It was my first experience with a naked case;I thought it was really fun to set it up from scratch. It has a 400 watt power source, which is probably wayyyy overkill for this system - but that's what they come with now. I'm not happy with how the case protects the various cards - no clip or screws, just a chase-around that keeps them from getting bumped. Not the most securely seated situation, but it's my only complaint about the case.
Let's see, other things . . . I found out *after* booting up (and much teeth gnashing) that the BIOS did not support a hard drive larger than 32 MB, something I couldn't have known earlier (and if there is a way to know this - on a used drive - someone please say so!!) Fortunately, Maxtor provides a "might work" workaround, and it did. It involves an extra jumper on the drive, plus lying to the BIOS. I didn't *have* an extra jumper, so I hopped in the car last night and drove about 25 minutes to the closest CompUSA, just before closing. The service desk gave me one free

- just thought I'd put that little plug in there, since they were so decent about it.
I put the old 1.2 gig HD in as a slave, just for backing up data files during rebuilds and the like. She could use it for a music server too, I guess.
Oh, I ended up needing a new keyboard, I decided to quit running the old style (what was that called? Before P/S 2 style?) via a serial port adapter. It has "quick buttons" for several functions which I think is sorta

, but my daughter thinks is cool (which is all that matters.)
The *only* issue is the network card, which gets its own thread and is likely actually a HOUSE issue LOL . . . so I'm a happy camper

. . . not to mention that the spousal unit will be getting his machine back too!!
Now I just need a proprietary sticker for the case that says "E-ma computers" LOLOL! (I-ma is Hebrew for "mama" and what my kids call me . . . a little play on words.)