I've been building my PC and ran into a snag on day 2—I'm having a hard time getting the motherboard to line up with the standoffs in my Montech AIR 903 Max case. When I remove the I/O shield, the motherboard lines up pretty well, but once I put the shield back on, it shifts again. I can get it almost aligned by pushing down hard on the left side near the I/O shield, but it feels risky. I really want to avoid leaving the I/O shield off, so does anyone have advice on how to get it to fit properly? I've included pictures to show the alignment issue: one without the shield and one with it.
3 Answers
Make sure the middle standoff where the motherboard goes is lined up. If you can get that one aligned, use a bit of pressure to get the rest as close as possible, and then tighten the screws one by one. It looks like the second pic could work; just needs a bit more fine-tuning!
You might just need to apply some pressure while screwing it in. Just be careful not to overdo it; a little force should help get it lined up right without stressing the board too much.
I was worried about that too, but I read that if you screw one down firmly, the rest should align better without causing damage.
One trick is to install the I/O shield first and then push against it while securing the motherboard. Once you get the first screw in, it should hold everything in place nicely.
Just a heads up, though—some I/O shields, like the one on my MSI Mag B650 Tomahawk Wifi, are preinstalled and can definitely complicate things.

The middle one pokes through fine for me too, but getting all the other standoffs aligned is tough. I can see how they get close when I push down, but there are still a few that are just off.