Rx6700 saphaire stuck on power on mainboard logo

,

hello friends
i have a rig with 3 rx5700 xt xfx and its ok
newly i bought a rx 6700xt nitro + saphaire. when i install this card the wont come up and its stuck on the motherboard first logo! i changed riser power and installed only this card and installed the gpu directly to the MB but still stuck !
what did should i to do ?
there is any specific bios setting on motherboard for this card specially ? or the GPU is corrupt ?
i will be appreciate if some one help me?

motherboard is asus b250 mining expert

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