Some ram missing...

Dear all,
Have got a weird missing ram problem.... recently, I bought an extra A-DATA 1Gb ram from my friend so I have got totally 2G DDR2(1G X 1G) ram installed but somehow the BIOS and Windows XP Sp3 only recognize 1.5G of ram, when I check with CPU-Z, it shows the correct amount of 2Gb ram, I have tried using only 1 slot and both ram are detected correctly(I just cant use them both?!) is there anything else I can try to get the missing ram back?

my system spec.:
MB: ECS P4M800PRO-M3 with latest BIOS
CPU: Celeron D 3.2G
RAM: 2GB ram total(only 1.5G recognized)
OS: Windows XP SP3

http://img130.imageshack.us/img130/9177/screen1we.th.jpg
http://img130.imageshack.us/img130/693/screen2ow.th.jpg
http://img44.imageshack.us/img44/7803/screen3lj.th.jpg
http://img38.imageshack.us/img38/7799/screen4wf.th.jpg
2 answers Last reply
More about some missing
  1. Are they the same?
  2. No, One is A-Data 1G DDR2 400 another one is Elixir 1Gb DDr2 533, I tried setting the DRAM speed in BIOS to 400 or AUTO, both doesn't work, still with 0.5G ram missing
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