The "defective" motherboard arrived yesterday and I mailed you a
refund check this morning.  But this evening I tested the board,
and found that the speed-setting jumpers were incorrect.  J6-J7-J8
were set for a clock speed of 50 MHz, but the CPU is a 486DX2/66
(clock speed 33 MHz, with an internal doubler to 66 MHz).
With these jumpers set for 50 MHz, the BIOS displayed the message
"CPU speed 100 MHz, but the booting process ended there.  These
jumper settings and clock speeds are clearly marked on the board,
as are most other settings.  Once I located the problem and reset 
J6-J7-J8 to a 33 MHz clock speed, the board booted normally and 
perfectly.
I tested this board before shipment, and it was pulled from a
working system where it had been operating flawlessly for several
years.  How the jumpers J6-J7-J8 got changed is anybody's guess;
it certainly didn't happen here.
It's conceivable that you had other problems.  I used a single 
72-pin SIMM in socket U17.  You may have used four 30-pin SIMMs 
in sockets U8 thru U11, in which case jumper JP5 *might* have 
needed to be changed.  (I can't test this theory because I have
no 30-pin SIMMs.)
It's also conceivable that one of the board mounts in your case
was contacting a trace on the PC board, shorting out the whole
works.  I tested the board on the bench, not mounted in a case.
Anyway, I'm sorry you had the problem, but the board goes back
up for sale:
>486 VESA motherboard with AMD 3v DX2/66 CPU, fan, 2 72-pin & 
>4 30-pin SIMM sockets, 7 expansion slots (3 are VESA), 256K 
>cache, no manual but most settings clearly marked on board....... $ 70.
 
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