Does the motherboard need to be screwed on all spots?

[MannyHopar]

My motherboard has 5 spots to be screwed to the case. I only screwed 4 because I didnt have a 5th one. Will this effect anything?

 

[Ubrales]

Normally not, but all fastening screws are supposed to be used for two purposes. 1) For secure fastening, and 2) the fastening screws are part of a ground loop to ground the motherboard at certain points per the motherboard design.

 

[Superkoopatrooper]

Long term probably... If you have a heavy cpu heatsink, it can cause flex on the board. If you have a heavy gpu, it can cause flex on the board. When you try to remove the gpu, it can cause flex on the board.

 

[Karadjgne]

MERGED QUESTION
Question from MannyHopar : "Does the motherboard need to be screwed on all spots?"

My motherboard has 5 spots to be screwed to the case. I only screwed 4 because I didnt have a 5th one. Will this effect anything?

Probably not. As long as it isn't one near a component you have to remove by pulling out and possibly bending the board too much by lifting it away from the standoff. Example: memory stick or PSU connector...

But motherboard screws are easily replaced. Most are 6-32's, but not all.

Atx mobo's come standard with 9 screws at a standard dimension. My ATX case only uses 8 of those screws by design, the 9th being a pre-installed alignment pin. I've seen many mobo's use just 4x screws, especially mITX and mATX, at the corners. As long as you have good support at the top of the board (all the board weight hangs) you could easily use just 3 screws and not worry about the bottom 2 holes.