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15 gpus on Asus b250 Mining Expert

Hey guys. I have Asus B250 mining expert with:
4 x rtx3060
5 x rx6700xt
6 x rx6800xt
I cant get them all running/showing up on hive.
I had the whole 15 plugged into the rig and it wont go into mining mode just gets a blank screen, as soon as I unplug one from mobo and have 14 cards it does turn on and go into mining mode.
Once I have the 14 x plugged in only 13 come up on hive dashboard.
Is this a mobo issue or hive issue?
Any setting on the mobo bios I need to change to get it to turn on with 15 gpus?