I have young kids so didn't want to leave the board and power supply on my desk out of fear they might try and play with itUsually there's 9 stand-off's on chassis supporting ATX motherboards -- the Tyan mobo has eight and one of the standoffs is directly under the memory slots. If the standoff isn't removed, it will short out the memory slot(s) (see pic - usually there's a standoff where the red circle is)
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The other thing is how tightly the motherboard is screwed into the standoffs - if some are differing heights or if the screws are over-tightened, the motherboard can bow and flex - that is REALLY bad as it can cause intermittent shorts and difficult to diagnose faults
Finally, the case and back panel can sometimes have things that touch solder points, components and traces, you need to be careful when installing the I/O shield for example
The good thing is that the motherboard is working, so you just have to go over all this with a fine toothed comb.
What case are you using?
so I put it into a corsair air 540 just so I can test everything and what not then it was going into my Lian li pc-p80 (it's in it now)
you ain't kidding about being careful with that I/O shield damn thing gave me a nasty cut on my finger OUCH