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If you are pretty sure it's the motherboard, why not just replace the motherboard with the same make+model motherboard with onboard video?
Then all your drivers, IDE chip, SATA chip, Network chip, Audio chip, VGA chip, etc etc etc., will be correct still, and doubt you would need to remove/re-install drivers and re-activate Windows.

I've bought used/new motherboards on E-bay before a time or two when I needed a particular one that was made/discontinued.

"plug my drives and TV tuner card into"


You know, if you use Windows, and change motherboards (a good Case/PS/Motherboard/RAM setup), your windows on your drives already has drivers for the chips on your old motherboard, not necessarily for your new one...
So, 1) you will need to fix the drivers/Windows re-find hardware, and probably 2) re-Activate Windows.

I'm not near you or would welcome you to take anything in my sheds, (Parts enough to build 20 to 50 computers, but those are all for AMD processors, not anything Intel-ish.)

I'm unclear, will it boot from a CD boot disk?

(Is there ant black n white text when first trying to boot, then it goes black and computer stops? SVGA drivers ok? Video card ok? Can you get to BIOS setup at all? (Before SVGA drivers try to load)

"no display on screen and then hangs"

I've actually seen that occur when video cards or RAM need to be removed, and re-inserted, and lately on one that had 2 RAM sticks, and one of the 3 went bad, it works fine with 2 sticks now, until I replace the third.
tried re-seating your video card and RAM?

And ... I have to ask ..... did the cat unplug your monitor? (It happens)