Hello to all listers

I have the most confusing problem I have ever encountered, and I am hoping
some one of you may be able to help.

I have a custom built machine.  It originally was built with AOpen AZ33
motherboard, duron 900 mhz processor [assembled in Malasia], 256 mb ram, 20
gb hdd.

The machine worked fine for about a month.  It absolutely will not boot.
The case and CPU fans run, but there is not post performed.

To date I have done the following:

Replaced the power supply.  Replaced the motherboard [twice], replaced the
processor, replaced the ram, replaced the video card.  I have tested the
memory and chip in other machines.  They work well.  I have put other CPUs
in this case, it won't boot.

I have carefully checked the mounting on the board.  There are 9 holes in
the board with metal backing indicating they are mounting holes.  Each of
them has a screw installed into a brass stand off.

I sure would like to hear some suggestions as to what to do with this
machine.

TIA

Mike Buraczewski
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