I'm installing a Gigabyte B450M DS3H in a Gamdias Atlas M3M case. When I fit the motherboard into the separate I/O shield and onto the case standoffs, I have to press it down slightly so the rear ports line up with the shield openings. This causes the bottom-right corner of the board to lift a little, although I can still align and tighten the screws. Is that amount of flex normal, or could screwing it down damage or bend the motherboard?
3 Answers
The board should sit flat on every standoff once the screws are installed, without obvious twisting or heavy flex. If one corner remains raised, remove it and check that the I/O shield is fully clipped into the case, that none of its metal tabs are caught inside a port, and that the motherboard mounting holes are centered over the standoffs. A tiny amount of initial flex is usually fine, but stop if the PCB bends noticeably or the ports are being forced sideways.
Check the case standoffs first, especially the center one. Some cases use a locating nub instead of a threaded standoff, and if it doesn’t line up with the motherboard’s mounting hole, it can hold the board at an angle. Also make sure there aren’t any extra standoffs installed under the board.
A separate I/O shield can require a small amount of pressure during the first installation. Its spring tabs and edges are designed to flex slightly as the motherboard is positioned. Gently press the board into place and start all the screws loosely before tightening them evenly. Don’t use the screws to pull the board down if it takes significant force.
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