Hello i have asrock 785gmh/128 motherboard and q is memory.i have 2x1gt stick (ddr400,same type ect).OS is win xp pro sp3(32).install amd,sm bus and other drivers.not raid problem is that only other memory stick work.if put other (alone) the comp not start but on the other stick comp work.if both are in place,comp not work,means it start but screen is black,fan rotates ect.. i test other memory stick pair and the results is same,second only to act,these were somthing pc2100 type. memory sticks is test in a other comp and both works ok. now i thinking that I did not do formatting and re-install OS,what these affect. what is problem?Did i miss something.. pzzz.