Hi, I am assembling a home theater pc, using a silverstone lc-20m case,foxconn nf4uk8aa motherboard,amd 64 cpu,seasonic s-12 500w psu and 1Gb of ram, when i got all of the above assembled i then tried to prower up the system as a test,but nothing happen no lights,no fans, nothing, if i plug in the keyboard the lights on the keyboard flash on and off,i have tried other psu’s nothing,used an other motherboard nothing,moved the ram around nothing. any help would be welcome