hi. i dunno izit really just pure force. i rem last time i spend more than 1hr to snap the damn thing in!

really, after 30min i lost my patience alr & forcing it anyhow, but only 1 side wanted to go it. in the end i removed the rear case fan & continued forcing, took another 30min before hearing the nice *SNAP!* success...
and another time when inserting mb, it keeps getting blocked dunno by shield tabs or case standoff alignment. in-out-in-out try sooo many times i was afraid i've been scaping the mb underside against the standoff so much tat will cause damage...
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this time diff, it only took me abt 15min (!!!) to snap the shield in. then the mb 1st time in snap into place. happy happy i put in mb screws, mount tower cooler etc. only later looked at rear ports saw p/s2 & top usb ports semi blocked (cannot insert usb in), bottom ports ok & aligned.
well, lots of frustration later (and some damage to i/o shield, a few screw heads & screw threads, and dropped screw driver onto mb...), i took out the i/o shield.
i suspect the alignment issue is likely due to 730t casing - either mb standoffs near the top are too short, or the mb tray not even & bulging slightly outwards at the top.
sorry for wot!