Thought I was going to luck out. But the system is showing signs of other problems, such as sporadic freezing. And it takes a good two minutes to start from an overnight shut-down, to complete a POST. So my secondary system is back in service, to keep my F@H processes going.
The only alternative is a Socket 775 mobo, with the 848P/ICH5 chipset. Found one for about 70 bucks, a suitable 3.2 Ghz CPU another 40 bucks. Might be lucky and the OS will just shrug off the differences. I can reuse my old video and sound card, plus the DDR 400 memory. Will miss that 'old faithful'.
That mobo I got as a replacement was DOA, "no BIOS" activity. Sent back.
Found a refurbished ASRock Conroe 865PE mobo on eBay, socket 775 with the similar chipset features. Set up with a Pentium 4/775/3.4HT/800 CPU and 2 x 1 GB Corsair CMS DDR400 memory. My W2K settled in with very few "hiccups" and is working great again.
The Chaintech mobo was set up on the test bench with a Northwood 2.8HT/800 CPU and it did a burn-in test with no problems! May have been too much current use (and heat) with the Prescott 3.2E CPU?
F@H.. to solve mankind's maladies.. in our lifetimes!