CPU does not give display or beep after removing of RAM

i have a serious problem in three of my office PC I just remove ram and when I put it again it does not give any Display or Beep note that when i press power button Key board lights(LED) switch on I also Replace the ram the existing ram also work in another pc. I also clean the slots but in vain.
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More about give display beep removing
  1. Post the specs of the old RAM and motherboard, and which RAM your trying to install
  2. Static damage?

    Try reseating the memory in the slot closest to the cpu

    I hope you cut the power to the tower first before doing any work...
  3. thanks for all who reply,

    it is intel Desktop Board model D 915 GAV with 256 MB 400MHZ RAM
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