If I am interpreting you correctly, you put a brass MoBo standoff in the wrong spot and where it made contact, it caused a short and fried the thing.
Try this after RTFM'ing:
1. The holes in the MoBo near the edges are easy to line up. Put standoffs in the MoBo tray holes where you are sure they go. Count them.
2. Place your MoBo in place and make sure you see all of the standoffs thru the holes....count them and make sure. See step 1....number should be same
3. Remove MoBo and place yellow "post its" over the holes on your MoBo tray. Put your MoBo back in place and, using a pencil, trace the holes in your MoBo onto the post it's below. Then stick standoffs where the pencil marks were.
4. Check the MoBo manual again, it will show you where all the holes are. Count the number on the picture in the manual ....make sure you have that many standoffs installed....no more, no less.
5. Place MoBo back in place and make sure that you can see a standoff at every MoBo hole.
6. I usually put the 1st screw in the corner which is opposite ("catty corner") the one near the inputs panel (place where you plug stuff in). IOW, panel is usually in upper right, so I put 1st screw in lower right. Don't tighten iny screws until all screws are in and turning fresly.