My system starting problem its says serial presence detect device data missing

sir,
i facing prblm vtb my system. when i start my system it doesn't open & any signal didn't transfer to attached device. when power off and on doing this process 2,3 times its open and says"SERIAL DATA PRESENCE DETECT DEVICE DATA MISSING OR INCONCLUSIVE. PROPERLY PROGRAMMED SPD DEVICE DATA IS REQUIRED FOR RELIABLE OPERATION. DDR2 400MHZ ASSINED AT SLOWEST TIMING"..........
I hope that i will get solution for it from ur's
thank u :sarcastic: :sarcastic:
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More about system starting problem serial presence detect device data missing
  1. SPD - ram

    go into the bios and manually configure the ram if possible to 1:1 or 667mhz, 1.9v and 5-5-5-18 timings and see how that posts every time
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