Problem with my DDR2

Hi all.

I ve got a motherboard with asus P5KPL/1600 as ram 2 * 1 gb Corsair XMS2. until the all goes well, but voila I 've had the opportunity i 'have the same memory for cheap and I therefore taken but my pc does boot and beep. Knowing that I tested all of my barrettes in pairs and that work that they want to simply say that as I

Thanks

bios update? which version?

yes I have put my bios update any all version I know that but it is the latest and updated only to processors.