dell m90 gpu

Hi,i have a dell m90 that the gpu went bad on, i bought a "AMD ATI Radeon X1400 256MB Graphics Card - XF422 0XF422" for it thinking it would work but it wouldnt.Powered up but nothing on screen, got the old one working for now by baking it but probably wont last, im not clued up on computers so ami missing something Ie downloading drivers before instalation ect or is the gpu i bought just broken?

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