Dual memory problems, not start

Users questions: Board is VIAK8T890, insert the two with the same DDR400 Kingston's memory can not start properly, but the board can read 1024M of memory, can not display the scroll bar to start, and the back has a black screen. Card is ATIRADEONX700SE, 128 M. CPU is the AMD2088 +. What is wrong? I think this is less likely to leave, because I bought a large group together. In addition to the reasons you said that there are no other possible reason?
Experts answer: may have a memory is false, so there are compatibility issues, Kingston memory Many false! Can look at the instructions not to plug in the dual channel memory slots may be better
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