motherboard shorting out?

Ok i could use some help with this. When my motherboard is outside the case sitting on the box it came in, i can power it up with everything connected fine. but when i mount it in my case it won't power on. the light comes on but when i press the power button the fan LED blinks and thats it. so i put little pices of electric tape on the back of my mobo where the spacers are so the mobo is not touching the brass spacers then it worked for a week. now it does not work inside my case? but outside my case it works???? is there something wrong with the brass spacers, no other metal is touching anything. Please help maybe i have missed something.

Specs.

mobo = Asus P5E
Case = Antec 900
CPU = Q6600
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More about motherboard shorting
  1. Double post.
  2. remove all the standoff and make sure only install what are necessary.
    check you case power switch and reset switch.
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