ATI 9550 Locks MB

I have an ASUS motherboard A7N266-VM/AA. I recently purchased the ATI RADEON 9550 128MB AGP. When I insert the 9550 into the AGP slot, the motherboard locks up. It wont even initiate the POST and no video signal to LCD display. I pull the 9550 and PC boots correctly. Is this a defective video card or incompatibility between the video card and motherboard. The motherboard supports 1.5v 4x AGP video cards like the 9550.

Any thoughts appreciated..thanks..

jamz
 
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