GPU is a XFX GeForce 6800 Xtreme http://www.xfxforce.com/web/product/...ationId=141227

but here's a little explanation to see if this will help further

this GPU was bought separately & installed on PC1[retail], then moved it to PC2[built]. on PC1 it worked fine, but now on PC2, it constantly gets stuck at that point

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